Support early request body buffering before upstream peer selection by CodyPubNub · Pull Request #816 · cloudflare/pingora

CodyPubNub · 2026-02-16T19:42:59Z

Resolves #780

Adds opt-in early body buffering to ProxyHttp behind the early_body_buffer Cargo feature. When early_request_body_buffer_limit() returns Some(max_size), the full request body is read before request_filter runs. The buffered body is available via Session::get_buffered_body() for inspection and Session::set_buffered_body() for mutation, and is automatically forwarded to HTTP/1.x, HTTP/2, and custom upstreams during the proxy phase, and through pipe_subrequest(InputBodyType::SaveBody).

New trait methods:

early_request_body_buffer_limit() — opt in to buffering with a size limit (default None)
early_request_body_buffer_timeout() — optionally bound the complete buffering phase, including body-filter callbacks (default None)
early_request_body_filter() — per-chunk callback during early buffering, before any header-phase filters run. Use for streaming processing (e.g., decompression) that doesn't depend on request_filter state. The normal request_body_filter() still runs during upstream forwarding.

Use cases:

Auth signature verification that needs the full body before making an auth decision
Content-based routing (e.g., routing GraphQL queries by operation name)
Body transformation before upstream selection
Streaming decompression during buffering via early_request_body_filter

Hook order: buffering runs after early_request_filter(), allow_spawning_subrequest(), and should_handle_downstream_abandonment(), and before request_filter() and upstream_peer(), so the abandonment opt-in is still decided right after early_request_filter() as documented on main. Buffering hooks must not read the downstream body themselves, including through a spawned subrequest.

Size limits and timeouts are enforced independently: Content-Length is checked before reading (fail fast), accumulated size is checked during streaming, and applications may configure a total buffering deadline. Exceeding the size limit returns HTTP 413; an expired deadline returns HTTP 408. The buffering hooks and the Session buffer APIs are gated behind early_body_buffer; when enabled, default None values preserve existing streaming behavior. Two shared H2 changes also apply with the feature disabled: write_continue_response() now sends the H2 100 Continue (previously dropped, since the H2 server ignores 1xx response headers) through a new v2::server::HttpSession::write_continue_response(), and the H2 replay adjustment described below.

Expect: 100-continue: automatically buffered HTTP/1.1 and HTTP/2 requests are acknowledged locally before the body is read. The original header remains visible to application filters, then is removed after upstream_request_filter() so it is not forwarded to HTTP/1.x, HTTP/2, or custom upstreams.

HTTP/2 body handling: requests without Content-Length (valid in HTTP/2) are handled correctly — only Content-Length: 0 skips the body read. A confirmed empty buffered body still sends END_STREAM upstream.

Retries and application-managed buffering: buffered bodies are retained and replayed across upstream retry attempts. Calling Session::set_buffered_body() explicitly marks the body as buffered, including None for a confirmed empty body; it fails unless the downstream body completed its declared framing. Applications using this path are responsible for fully consuming the downstream body, handling Expect: 100-continue, and updating framing headers after body mutation. Regression tests cover fixed-length and chunked retries, application-managed buffering, oversize rejection, single-attempt forwarding, local 100 Continue, total buffering timeout, empty HTTP/2 bodies, custom-upstream forwarding and replay, subrequest pipes, and truncated application-supplied bodies.

Custom upstreams: the buffered body is forwarded and replayed as on HTTP/1.x and HTTP/2. The request header's end flag comes from the buffered body, so a filtered or replaced empty body ends the request on its header.

Subrequest pipes: SaveBody(limit) on a buffered session forwards the buffered body once the subrequest asks for input. Downstream module body filters run on it and the saved body captures their output, with the usual limit and truncation. A subrequest that never reads gets nothing.

H2 replay (all builds): an attempt's initial send of a complete request body no longer races the upstream write against downstream stream closure while the cache supports streaming partial writes. Previously a replay blocked on upstream flow control lost downstream_closed and failed the attempt as soon as an already-reset client was noticed, instead of applying the loop's cache-fill policy. The H2 replay adjustment also changes behavior with early_body_buffer disabled: complete initial replays from the ordinary retry buffer finish without racing downstream closure while partial-write caching remains enabled after body filters. Other request-body writes keep the closure watch, including uncached replays, incomplete retry buffers, and streamed writes.

Includes a body_routing example demonstrating all three patterns — stream, peek, and mutate:

RUST_LOG=INFO cargo run --features openssl,early_body_buffer --example body_routing

# Peek + mutate — body is inspected for routing then wrapped in an envelope:
curl -X POST 127.0.0.1:6193/post -H "Host: httpbin.org" -H "Content-Type: application/json" -d '{"route": "beta"}'

# Multi-chunk — early_request_body_filter fires per-chunk:
printf 'POST /post HTTP/1.1\r\nHost: httpbin.org\r\nTransfer-Encoding: chunked\r\n\r\na\r\n{"part":1}\r\na\r\n{"part":2}\r\n0\r\n\r\n' | nc 127.0.0.1 6193

# No buffering — GET requests pass through unchanged:
curl 127.0.0.1:6193/get -H "Host: httpbin.org"

Phase docs and mermaid charts updated to include the new phase.

Add opt-in request body buffering via request_body_buffer_limit() trait method. When implemented, the full request body is read and filtered before request_filter runs, making it available for auth signature verification and content-based routing decisions. Resolves cloudflare#780

…buffering # Conflicts: # pingora-proxy/src/lib.rs

CodyPubNub · 2026-03-12T17:00:30Z

Hi @johnhurt 👋 friendly ping on this. This implements the feature requested in #780 (which has the help wanted label). Happy to adjust the approach if the team has a different direction in mind. Would appreciate any initial feedback on whether this is something you'd consider merging.

johnhurt · 2026-03-13T17:31:29Z

Hey, thanks for your patience. I realize this ticket missed some of our triage steps. It's a big change, but it seems worthwhile. We will check it out to make sure the impact on our system wouldn't be too extreme.

One thing that will make this easier to review is to make this fully configurable so that we can opt out of this change.

CodyPubNub · 2026-03-13T17:36:37Z

Hey, thanks for your patience. I realize this ticket missed some of our triage steps. It's a big change, but it seems worthwhile. We will check it out to make sure the impact on our system wouldn't be too extreme.

One thing that will make this easier to review is to make this fully configurable so that we can opt out of this change.

Thanks for taking a look! The feature is fully opt-in, request_body_buffer_limit() returns None by default, and when it does, buffer_request_body_early() returns immediately with no side effects. No existing code paths are altered unless a user explicitly overrides that trait method to return Some(max_size). Happy to add additional gating if needed.

PiotrSikora

Hi @CodyPubNub,
this is completely unsolicited drive-by review (I have no relationship with the project, so my feedback might be different than that from maintainers), but I was recently looking at Pingora and was surprised by the lack of request body buffering before establishing connection to the upstream, so I'm also interested in solving this, albeit for a more generic use case.

PiotrSikora · 2026-03-17T03:59:00Z

+            match body_chunk {
+                Some(data) => {
+                    let is_body_done = session.downstream_session.is_body_done();
+
+                    // Call request_body_filter for each chunk
+                    let mut filter_data: Option<Bytes> = Some(data);
+                    session
+                        .downstream_modules_ctx
+                        .request_body_filter(&mut filter_data, is_body_done)
+                        .await?;
+                    self.inner
+                        .request_body_filter(session, &mut filter_data, is_body_done, ctx)
+                        .await?;
+
+                    // Accumulate the (possibly filtered) data
+                    if let Some(filtered) = filter_data {
+                        total_size += filtered.len();
+
+                        // Check size limit during accumulation (streaming protection)
+                        if total_size > max_size {
+                            return Error::e_explain(
+                                HTTPStatus(413),
+                                format!(
+                                    "Request body exceeded limit: {} > {} bytes",
+                                    total_size, max_size
+                                ),
+                            );
+                        }
+
+                        body_parts.push(filtered);
+                    }
+
+                    if is_body_done {
+                        break;
+                    }
+                }
+                None => {
+                    // End of body, call filter with end_of_stream=true
+                    let mut filter_data: Option<Bytes> = None;
+                    session
+                        .downstream_modules_ctx
+                        .request_body_filter(&mut filter_data, true)
+                        .await?;
+                    self.inner
+                        .request_body_filter(session, &mut filter_data, true, ctx)
+                        .await?;
+
+                    // Collect any final data from the filter
+                    if let Some(filtered) = filter_data {
+                        total_size += filtered.len();
+
+                        // Final size check
+                        if total_size > max_size {
+                            return Error::e_explain(
+                                HTTPStatus(413),
+                                format!(
+                                    "Request body exceeded limit: {} > {} bytes",
+                                    total_size, max_size
+                                ),
+                            );
+                        }
+
+                        body_parts.push(filtered);
+                    }
+                    break;
+                }


Both of those branches contain virtually the same code.

Could you de-duplicate this and use if let Some(data) = body_chunk { ... } where needed?

PiotrSikora · 2026-03-17T04:03:05Z

+                    session
+                        .downstream_modules_ctx
+                        .request_body_filter(&mut filter_data, is_body_done)
+                        .await?;
+                    self.inner
+                        .request_body_filter(session, &mut filter_data, is_body_done, ctx)
+                        .await?;


This results in wrong and error-prone ordering of callbacks, i.e. request body callbacks (HttpModule::request_body_filter and ProxyHttp::request_body_filter) are called before request headers callbacks (HttpModule::request_header_filter and ProxyHttp::request_filter).

The buffered request body is available in request_filter using get_buffered_body to perform any business logic based on the request body, so I'm not sure why you need to call those filters here. You should use this step only to pre-read and buffer the request body, and then push it through request_body_filter after request_filter is done.

Alternatively, you could add early_request_body_filter to avoid messing with the existing request flow.

PiotrSikora · 2026-03-17T04:22:23Z

+        // Get Content-Length if present (for early size check)
+        let content_length = session
+            .downstream_session
+            .req_header()
+            .headers
+            .get(header::CONTENT_LENGTH)
+            .and_then(|v| v.to_str().ok())
+            .and_then(|s| s.parse::<usize>().ok());
+
+        // Fail fast: check Content-Length before reading
+        if let Some(cl) = content_length {
+            if cl > max_size {
+                return Error::e_explain(
+                    HTTPStatus(413),
+                    format!(
+                        "Request body too large: Content-Length {} exceeds limit {} bytes",
+                        cl, max_size
+                    ),
+                );
+            }
+        }
+
+        // Check if there's a body to read (Content-Length > 0 or Transfer-Encoding)
+        let has_body = content_length.is_some_and(|len| len > 0)
+            || session
+                .downstream_session
+                .req_header()
+                .headers
+                .get(header::TRANSFER_ENCODING)
+                .is_some();
+
+        if !has_body {
+            // No body to buffer, mark as done
+            session.mark_body_buffered();
+            return Ok(());
+        }


This doesn't work with HTTP/2 requests that don't contain the Content-Length header.

PiotrSikora · 2026-03-17T04:55:38Z

+    /// Determine whether to buffer the entire request body before connecting to upstream.
+    ///
+    /// This is called after [`Self::early_request_filter()`] but before [`Self::request_filter()`]
+    /// and [`Self::upstream_peer()`]. The body is buffered in `Session::buffered_request_body`
+    /// and can be accessed via [`Session::get_buffered_body()`].
+    ///
+    /// # Returns
+    /// - `None`: Don't buffer, stream body to upstream (default)
+    /// - `Some(max_size)`: Buffer body with size limit, return 413 error if exceeded
+    ///
+    /// # Use Cases
+    /// - Auth signature verification (need full body before auth decision)
+    /// - Content-based routing decisions
+    /// - Body transformation before upstream selection
+    ///
+    /// # Size Limit Enforcement
+    /// When returning `Some(max_size)`:
+    /// - Content-Length header is checked first (fail fast before reading)
+    /// - Body size is checked during accumulation (streaming protection)
+    /// - If exceeded, returns HTTP 413 (Payload Too Large)


This approach works well for a few specific use cases, but generic proxies should allow buffering up to the buffer limit, and then resume reading and forward remaining data once the upstream is connected, without rejecting the requests with request body larger than the buffer limit.

This approach works well for a few specific use cases, but generic proxies should allow buffering up to the buffer limit, and then resume reading and forward remaining data once the upstream is connected, without rejecting the requests with request body larger than the buffer limit.

I agree buffer-then-stream is useful for generic proxies. Inspecting the head of a large upload without rejecting it has clear value.

The use case driving this PR is authorization: the auth decision depends on a signature computed over the complete body, so a partial buffer isn't sufficient. The full body has to be available before upstream_peer. Without a hard size limit that becomes an unbounded memory commitment per request, which is why request_body_buffer_limit returns a max size and rejects with 413 if exceeded.

I think buffer-then-stream is a different feature with different semantics (partial visibility, no 413, resume streaming after peer selection). I've scoped this PR to the full-buffer case, but buffer-then-stream would be a solid follow-up.

FWIW, my use case is similar to @CodyPubNub's. We need the full request body in order to make decisions about whether to allow the request to proceed.

(also unaffiliated with the project, just 👀 this PR because I want this feature)

I think buffer-then-stream is a different feature with different semantics (partial visibility, no 413, resume streaming after peer selection). I've scoped this PR to the full-buffer case, but buffer-then-stream would be a solid follow-up.

Right, the feature is different on a high-level, but both require buffering request body before it can be forwarded upstream, and once you have the generic capability, it's easy to support your use case (i.e. block forwarding until max_size bytes or complete request body).

@PiotrSikora

- Fix HTTP/2 body detection: replace has_body heuristic (Content-Length or Transfer-Encoding) with explicit Content-Length == 0 skip. H2 POST without Content-Length was incorrectly treated as bodyless. - Collapse two near-identical match arms (Some/None) into a unified flow using end_of_body flag, removing ~40 lines of duplication. Addresses review comments 1 and 3 from @PiotrSikora.

@PiotrSikora

- New trait method runs per-chunk during buffer_request_body_early(), before request_header_filter — avoids calling request_body_filter out of phase order. - Remove is_body_buffered() skip guards from proxy_h1/h2 — normal request_body_filter runs unguarded during upstream forwarding. - Update body_routing example to demonstrate the streaming callback. - Add early_request_body_filter to phase docs and mermaid charts. Addresses review comment 2 from @PiotrSikora.

CodyPubNub · 2026-03-17T07:05:40Z

Hi @CodyPubNub, this is completely unsolicited drive-by review (I have no relationship with the project, so my feedback might be different than that from maintainers), but I was recently looking at Pingora and was surprised by the lack of request body buffering before establishing connection to the upstream, so I'm also interested in solving this, albeit for a more generic use case.

Thanks for the thorough review, @PiotrSikora. I really appreciate you taking the time.

I've addressed comments 1-3:

Comment 1 (dedup read loop): collapsed the two Some/None match arms into a unified flow with an end_of_body flag.
Comment 2 (callback ordering): added early_request_body_filter() as a dedicated trait method. The early buffering loop calls this instead of request_body_filter, so the existing callback contract is preserved and request_body_filter runs normally during upstream forwarding with no skip guards. Updated phase docs and mermaid charts.
Comment 3 (HTTP/2 body detection): replaced the has_body heuristic with content_length == Some(0). Only skips the read when body is explicitly zero-length.

PiotrSikora

Thanks! This looks much better now.

PiotrSikora · 2026-03-17T16:14:45Z

+        let mut downstream_state = if body_was_buffered {
+            DownstreamStateMachine::PreBuffered
+        } else {
+            DownstreamStateMachine::new(session.as_mut().is_body_done())
+        };
+
+        // Use pre-buffered body if available, otherwise check for retry buffer
+        let buffer = if body_was_buffered {
+            pre_buffered_body
+        } else {
+            session.as_mut().get_retry_buffer()
+        };


Nit: You could return (downstream_state, buffer) tuple here (same in H1 proxy).

PiotrSikora · 2026-03-17T16:16:37Z

+    /// - Content-Length header is checked first (fail fast before reading)
+    /// - Body size is checked during accumulation (streaming protection)
+    /// - If exceeded, returns HTTP 413 (Payload Too Large)
+    fn request_body_buffer_limit(&self, _session: &Session, _ctx: &Self::CTX) -> Option<usize> {


Nit: early_request_body_buffer_limit

PiotrSikora · 2026-03-17T16:37:06Z

+    /// Determine whether to buffer the entire request body before connecting to upstream.
+    ///
+    /// This is called after [`Self::early_request_filter()`] but before [`Self::request_filter()`]
+    /// and [`Self::upstream_peer()`]. The body is buffered in `Session::buffered_request_body`
+    /// and can be accessed via [`Session::get_buffered_body()`].
+    ///
+    /// # Returns
+    /// - `None`: Don't buffer, stream body to upstream (default)
+    /// - `Some(max_size)`: Buffer body with size limit, return 413 error if exceeded
+    ///
+    /// # Use Cases
+    /// - Auth signature verification (need full body before auth decision)
+    /// - Content-based routing decisions
+    /// - Body transformation before upstream selection
+    ///
+    /// # Size Limit Enforcement
+    /// When returning `Some(max_size)`:
+    /// - Content-Length header is checked first (fail fast before reading)
+    /// - Body size is checked during accumulation (streaming protection)
+    /// - If exceeded, returns HTTP 413 (Payload Too Large)


I think buffer-then-stream is a different feature with different semantics (partial visibility, no 413, resume streaming after peer selection). I've scoped this PR to the full-buffer case, but buffer-then-stream would be a solid follow-up.

Right, the feature is different on a high-level, but both require buffering request body before it can be forwarded upstream, and once you have the generic capability, it's easy to support your use case (i.e. block forwarding until max_size bytes or complete request body).

@PiotrSikora

- Rename request_body_buffer_limit → early_request_body_buffer_limit for consistency with early_request_body_filter (comment 6) - Collapse downstream_state + buffer into tuple return in proxy_h1 and proxy_h2 (comment 5) - Align inline comments with existing Cloudflare style - Update body_routing example and phase docs Addresses review comments 5 and 6 from @PiotrSikora.

QiiHeng3 · 2026-03-31T14:59:34Z

@CodyPubNub This is a great feature I've been eagerly waiting for！！！I'm building a Rust-based Kubernetes ingress/gateway on top of Pingora, and the lack of early request body access has been a major pain point for us.

CodyPubNub · 2026-05-04T16:19:02Z

Hi @johnhurt, I was wondering if there was any updates or feedback from your team to share about this change. Thank you!

johnhurt · 2026-05-04T16:29:45Z

Hey, yeah. Sorry for the delay. We have been discussing this internally, so we would like to pull this in. I should have come back and explained what I meant by "configurable". These kinds of features even if they are off by default still incur a cost in runtime (even if it's a minimal branch) and risk. That's why we ask contributors to make changes that touch the main proxy trait configurable by cargo feature to avoid the. Checkout the connection filter feature for an example.

CodyPubNub · 2026-05-04T17:18:18Z

Hey, yeah. Sorry for the delay. We have been discussing this internally, so we would like to pull this in. I should have come back and explained what I meant by "configurable". These kinds of features even if they are off by default still incur a cost in runtime (even if it's a minimal branch) and risk. That's why we ask contributors to make changes that touch the main proxy trait configurable by cargo feature to avoid the. Checkout the connection filter feature for an example.

I appreciate the feedback. I've added an early_body_buffer feature to gate the behavior introduced in this PR. Please let me know if there's anything else. Thank you!

CodyPubNub · 2026-06-17T16:58:23Z

Hi @johnhurt I was wondering if there were any updates to share on the team's thoughts toward this PR. It would be very helpful for this, or something very much like this to be available in the main branch. Thank you 🙏

jeremyhamning · 2026-07-20T12:51:06Z

Hello @johnhurt, I'm also wondering if this could be reviewed and merged soon?

Resolve conflict in pingora-proxy/src/lib.rs: - downstream_custom_message() now returns the DownstreamCustomMessageReader type alias introduced by main's custom-message retry fix (7c04f54), rather than the inlined boxed-Stream signature the branch forked from. - Add upstream_h1_upgrade_status_mismatch to the test-only new_h1_with_http_session() constructor. Main added this Session field, and because the constructor is gated behind early_body_buffer it compiled fine on default features while breaking the feature build — a silent conflict git could not flag.

- Early buffering drains downstream before retry buffering starts, so taking the session buffer leaves retries with no body to replay. - Clone the bounded buffer per attempt, share lazy selection across H1/H2, and remove the destructive take_buffered_body API. - Add self-contained regression coverage for fixed-length and chunked bodies.

CodyPubNub · 2026-07-27T18:32:50Z

Hi @drcaramelsyrup I was wondering if you or others on the team have had a chance to think about this PR. Thank you 🙏

- avoid sending a second END_STREAM after empty requests complete on HEADERS - preserve explicit END_STREAM forwarding when filters remove a non-empty body - add regression coverage for Content-Length: 0 requests

rxdiscovery · 2026-09-10T13:17:28Z

Hello,
Thank you very much @CodyPubNub for your contribution.

I noticed that session.set_buffered_body() has no effect when called inside early_request_body_filter.
In this example, the buffer remains full even though we assigned an empty Bytes to it.

async fn early_request_body_filter(
    &self,
    session: &mut Session,
    body: &mut Option<Bytes>,
    end_of_stream: bool,
    ctx: &mut Self::CTX,
) -> Result<()>
where
    Self::CTX: Send + Sync,
{

    if end_of_stream {
         session.set_buffered_body(Some(Bytes::new()));
    }
  
    Ok(())
}

Do you have any idea what might be causing this?

CodyPubNub · 2026-09-10T15:50:57Z

Hello, Thank you very much @CodyPubNub for your contribution.

I noticed that session.set_buffered_body() has no effect when called inside early_request_body_filter. In this example, the buffer remains full even though we assigned an empty Bytes to it.
async fn early_request_body_filter(
    &self,
    session: &mut Session,
    body: &mut Option<Bytes>,
    end_of_stream: bool,
    ctx: &mut Self::CTX,
) -> Result<()>
where
    Self::CTX: Send + Sync,
{

    if end_of_stream {
         session.set_buffered_body(Some(Bytes::new()));
    }
  
    Ok(())
}
Do you have any idea what might be causing this?

Hi @rxdiscovery, set_buffered_body() should not be called from early_request_body_filter(). That callback operates on each chunk through its body argument. Once the buffering loop finishes, Pingora assembles the filtered chunks and stores the result, overwriting anything assigned during the loop. If the filtered chunks total zero bytes, Pingora only marks the body as buffered and does not replace the assignment.

To discard a chunk, set *body = None. To drop the entire body, do so on every invocation. To replace the fully assembled body, call session.set_buffered_body() later from request_filter().

Either way, update the request framing to match the resulting body. For example, leaving Content-Length unchanged after removing the body can leave an HTTP/1.1 upstream waiting for bytes that will never arrive.

This is expected lifecycle behavior, though the API documentation could make the restriction clearer.

Reported as a bug: set_buffered_body() appeared to have no effect from early_request_body_filter(), because the buffering loop assembles the filtered chunks after the callback returns and overwrites the assignment. - explain why buffered-body replacement belongs in request_filter - document chunk mutation and request framing responsibilities - note the current limitation when adding bodies to empty H2 requests

Replacing an empty H2 request body failed because stream completion was derived from the consumed downstream body instead of the replacement. - use buffered body state for H2 stream completion - cover body replacement across protocol boundaries - remove the obsolete documented limitation

rxdiscovery · 2026-09-11T00:19:23Z

Thank you for your responsiveness @CodyPubNub ;

(@CodyPubNub + @drcaramelsyrup)

In my view, reading the request body before request_filter feels somewhat counterintuitive in the overall request lifecycle. Furthermore, early_request_body_buffer_limit effectively behaves like a request_filter, since the buffer size is determined solely by inspecting the headers.

Wouldn't it be cleaner to introduce an enable_early_request_body_filter() method that explicitly instructs Pingora whether or not to defer sending the headers upstream?

This would yield two clear, distinct scenarios:

Standard streaming / non-buffered:

request_filter -> [enable_early_request_body_filter() = false] -> [send headers] -> request_body_filter() -> [send body]

Buffered / deferred headers:

request_filter -> [enable_early_request_body_filter() = true] -> request_body_filter() -> [send headers + body]

CodyPubNub · 2026-09-11T03:01:00Z

@rxdiscovery I may be misunderstanding the proposal, but a few premises here don't match the implementation.

early_request_body_buffer_limit() does not behave like request_filter(). It selects whether automatic buffering is enabled and supplies the maximum permitted size. The decision can use both the Session and context populated by early_request_filter(); it is not limited to inspecting headers.

Content-Length is only used for an optional fail-fast rejection. Pingora also checks the accumulated body size as each chunk is read and filtered, so missing, chunked, or incorrect Content-Length values do not control or bypass enforcement.

This hook also does not decide whether to defer upstream headers. At this phase no upstream peer has been selected and no upstream connection or header transmission exists yet.

Running request_filter() before buffering would remove the primary capability introduced by this PR: making the complete body available inside request_filter() for authentication, mutation, and routing before upstream_peer().

Finally, request_body_filter() remains a forwarding-time callback and runs for every upstream attempt, including retries. early_request_body_filter() instead runs once while consuming the downstream body, so the two callbacks intentionally have different lifecycles.

Could you clarify the concrete operation you need to perform, and which information must be available before and after it? I'm not yet seeing what behavior the proposed ordering enables that the current lifecycle does not.

rxdiscovery · 2026-09-11T09:12:50Z

@CodyPubNub

Sorry if I wasn't very clear earlier, let me explain the idea :

Instead of adding several additional phases, which could impact overall performance and increase the complexity of the Pingora workflow. Why not just expose a method that can be called, for example, from early_request_filter, such as enable_request_body_buffer(max_buffer_size: usize)?
When called, it would trigger internal processing within Pingora right before request_filter is invoked. This would allow us to retrieve the buffer via get_request_body_buffer or modify it using set_request_body_buffer.

I hope this makes things clearer.

On another note, I have a question: in your PR, does early_buffer share the same buffer as Pingora's internal one, so we avoid duplicating data in memory if retry is enabled?

CodyPubNub · 2026-09-11T14:21:09Z

Thanks @rxdiscovery, I understand the proposal. It is an alternative API design rather than a correctness issue with this implementation.

This PR implements the behavior requested in #780 and refined through maintainer review. The limit and timeout methods are configuration hooks, not additional phases, and the per-chunk callback is intentional. I don't plan to redesign the API around an imperative Session setter unless the maintainers request it. If you would like that alternative considered, please open a separate issue.

Regarding memory, the early-buffered body becomes the canonical replay source. Pingora's ordinary retry buffer does not retain another payload copy, and retries use reference-counted Bytes clones sharing the same allocation.

To keep this PR focused, I'm going to leave further exploration of alternative API designs to a separate discussion.

zaidoon1 · 2026-09-15T17:33:49Z

-        {
+        #[cfg(feature = "early_body_buffer")]
+        let body_replayable =
+            session.req_header().method.is_idempotent() || session.is_body_buffered();


The session.is_body_buffered() alternative lets the default policy retry POSTs that have already reached the origin. In a local test, the origin read the full POST and closed before replying on a reused connection, then received the same POST again.

Please keep the default restriction to idempotent methods. Applications can opt in through error_while_proxy() when they know the operation can be repeated. The replay tests can use PUT or an explicit policy override.

zaidoon1 · 2026-09-15T17:33:49Z

+        };
+
        // retry, send buffer if it exists or body empty
        if buffer.is_some() || session.as_mut().is_body_empty() {


When an early filter removes a non-empty body and clears its framing headers, buffer is None but is_body_empty() still reflects the original downstream body. We skip the body task here, even though the upstream request was given Transfer-Encoding: chunked, so the origin never receives the terminating chunk.

A strict H1 origin times out in this case. Please send the final body task for a buffered request even when its buffer is None, and add an H1 counterpart to the filtered-empty H2 test.

zaidoon1 · 2026-09-15T17:33:49Z

+
+            // accumulate the (possibly filtered) data
+            if let Some(filtered) = filter_data {
+                total_size += filtered.len();


total_size only counts bytes left after early_request_body_filter(). With a limit of 8 bytes and a filter that discards the body, the same 17-byte POST returns 413 with Content-Length but 200 with chunked encoding. A shrinking filter can therefore keep this loop reading past the advertised limit.

Please enforce the limit on input bytes before running the filter as well as checking the retained bytes.

zaidoon1 · 2026-09-15T17:33:49Z

+        // Content-Length: 0 means no body; for all other cases (no Content-Length,
+        // Transfer-Encoding, HTTP/2) attempt to read. read_request_body returns
+        // None immediately if there's nothing.
+        if content_length == Some(0) {


This returns before initializing the H1 body reader. If request_filter() then replaces the empty body and updates Content-Length, the reader initializes later from the replacement length and thinks the client still owes those bytes. The response gets Connection: close, even though the original request body is complete.

I reproduced this with an empty request followed by body replacement. Content-Length: 0 loses keepalive, while the same request without that header keeps it. Initialize the downstream reader from the original framing before marking the body buffered, and check connection reuse in the replacement test.

zaidoon1 · 2026-09-15T17:33:49Z

+            // common case: a single chunk can be moved out without a second copy
+            session.set_buffered_body(body_parts.pop());
+        } else {
+            let mut combined = bytes::BytesMut::with_capacity(total_size);


This allocates total_size while all the original chunks are still live. For a body arriving in several chunks, that adds another allocation as large as the whole body, on top of the retained chunks and the Vec<Bytes>.

Please accumulate into a BytesMut once the second chunk arrives, using the checked Content-Length when available, while keeping the single-chunk fast path.

zaidoon1 · 2026-09-15T17:33:49Z

+    /// - Body size is checked during accumulation (streaming protection)
+    /// - If exceeded, returns HTTP 413 (Payload Too Large)
+    ///
+    /// Use [`Self::early_request_body_buffer_timeout()`] to apply a total deadline to this phase.


Please mention the retry implications here too. Automatically buffered bodies bypass the usual 64 KiB retry buffer and replay the complete retained body on each eligible retry. For example, Some(64 << 20) allows replaying a 64 MiB body on every attempt. retry_buffer_truncated() doesn't reflect the size of this separate buffer.

zaidoon1 · 2026-09-15T17:33:49Z

+//! retry replay, protocol completion, local `100 Continue` handling, and total buffering
+//! deadlines.
+
+#![cfg(feature = "early_body_buffer")]


early_body_buffer isn't enabled by any build or test command in .github/workflows/build.yml. Since it isn't a default feature either, the early buffering code and this entire test file are compiled out of those build and test runs.

Please add a CI run with --features early_body_buffer and a supported TLS backend, while keeping the existing run with the feature disabled.

rxdiscovery · 2026-09-16T14:30:26Z

Hi @CodyPubNub , could you please take into account the optimizations mentioned by @zaidoon1 (...whom I’d like to thank, by the way, for his very detailed feedback.) ? This will prevent high memory usage and improve performance.

- keep non-idempotent retries an explicit application policy to avoid duplicate POSTs by default - enforce limits before and after filtering while reducing multi-chunk peak memory - complete empty H1 bodies and preserve keepalive when replacing originally empty requests - add deterministic regression coverage and a feature-enabled CI lane

CodyPubNub · 2026-09-17T20:07:33Z

@zaidoon1 Thank you for the thorough review. I've addressed all the issues you flagged and added regression coverage for the retained-size limit and default non-idempotent retry behavior. I'd appreciate another look when you have a chance.

jeremyhamning · 2026-10-05T14:33:23Z

Hello @zaidoon1 and @drcaramelsyrup, could please review again so we can potentially get this merged soon? 🙏

zaidoon1

Thanks, my earlier comments all look addressed. Found a few more things on another pass.

zaidoon1 · 2026-10-06T06:49:50Z

+///
+/// The fallback must remain lazy because `is_body_done()` can initialize the H1 body reader.
+#[cfg(feature = "early_body_buffer")]
+pub(crate) fn select_upstream_body_source(


proxy_custom.rs doesn't use this, so a buffered body never makes it to a custom upstream. The header goes out as non-empty, is_body_done() is already true and the retry buffer is empty, so the upstream gets no body and no end of stream. I know custom support is a follow-up, but until then can we return an error in the custom path when is_body_buffered() is set? Moving this onto Session would also let h1, h2 and custom share it instead of copying the same block into each.

zaidoon1 · 2026-10-06T06:49:50Z

+    ///
+    /// Requires the `early_body_buffer` feature.
+    #[cfg(feature = "early_body_buffer")]
+    fn early_request_body_buffer_timeout(


With this defaulting to None, nothing bounds an H2 upload during buffering. H2 body reads have no per-read timeout (read_body_bytes in v2/server.rs still has a TODO), so a client can send HEADERS without END_STREAM and park the request forever. H1 isn't much better since the 60s read timeout resets on every read. In streaming mode the upstream's timeouts eventually kick in, but there's no upstream yet here. Can we default to a finite deadline when buffering is on, or at least call this out in the docs?

zaidoon1 · 2026-10-06T06:49:50Z

+                    let capacity = content_length.unwrap_or(retained_size).max(retained_size);
+                    let mut body = bytes::BytesMut::with_capacity(capacity);


This sizes the allocation from the client's Content-Length, not from what we've actually received. A client can claim max_size, send two 1-byte chunks and get a max_size allocation. And if someone uses Some(usize::MAX) to mean no limit, Content-Length: 9223372036854775807 makes the allocation fail, which aborts the process. My earlier suggestion to pre-size from Content-Length didn't account for this, so it needs a cap, something like cl.min(1 << 20), and let BytesMut grow past that.

zaidoon1 · 2026-10-06T06:49:51Z

+            return Ok(());
+        }
+
+        if is_expect_continue_req(session.downstream_session.req_header()) {


is_expect_continue_req only matches HTTP/1.1, but the Expect header gets stripped for every buffered request in both proxy_h1 and proxy_h2. So an H2 client sending expect: 100-continue never gets a 100 from us or the upstream, and it stalls until its own expect timeout (or forever if it doesn't have one). write_continue_response already handles H2, so I think H2 just needs to be checked here too.

zaidoon1 · 2026-10-06T06:49:51Z

+            {
+                Ok(result) => result,
+                Err(_) => Error::e_explain(
+                    ReadTimedout,


With the default fail_to_proxy this turns into a 400, since a downstream ReadTimedout falls through to the 400 case. The 408 in total_buffering_timeout_bounds_slow_request_body only comes from the test's own fail_to_proxy override. Should this be HTTPStatus(408)? Either way I'd have the test use the default so it shows what users actually get.

zaidoon1 · 2026-10-06T06:49:51Z

+    /// handle `Expect: 100-continue` before reading. It must also update `Content-Length` and
+    /// `Transfer-Encoding` to describe the supplied body.
+    #[cfg(feature = "early_body_buffer")]
+    pub fn set_buffered_body(&mut self, body: Option<Bytes>) {


Nothing checks that the caller actually read the downstream body before calling this. If they didn't and then update Content-Length like the docs say, the H1 body reader initializes from the new length (it reads the live header), so the original body gets framed with the wrong length. Can we require is_body_done() here and return an error otherwise? That also pins the reader to the original framing.

I'd also make mark_body_buffered() crate-private. It overlaps with set_buffered_body(None) but keeps an existing body instead of clearing it, which is confusing as public API.

zaidoon1 · 2026-10-06T06:49:51Z

+    /// before forwarding. Pingora emits HTTP/2 stream termination itself based on the downstream
+    /// request rather than the chunks retained by this filter.


This isn't true anymore after 2247998. H2 completion now comes from the buffered body (get_buffered_body().is_none_or(Bytes::is_empty) in proxy_h2), not the downstream request. The same sentence is in docs/user_guide/phase.md too.

zaidoon1 · 2026-10-06T06:49:51Z

        let mut e = e.more_context(format!("Peer: {}", peer));
-        if !session.req_header().method.is_idempotent() || session.as_ref().retry_buffer_truncated()
-        {
+        let body_replayable = session.req_header().method.is_idempotent();


nit: this is method idempotency, not whether the body can be replayed, so the name is misleading. Since behavior didn't change I'd just revert this and the doc reflow above.

zaidoon1 · 2026-10-06T06:49:51Z

        }
    }

+    struct NonIdempotentRetryProxy;


This only exercises RetryType::decide_reuse through a test double, so it isn't really testing the proxy, and it's unrelated to this feature. I'd drop it along with NonIdempotentRetryProxy.

zaidoon1 · 2026-10-06T06:49:51Z

+        run: |
+          cargo check --package pingora-proxy --all-targets --features openssl,early_body_buffer
+          cargo test --package pingora-proxy --features openssl,early_body_buffer \
+            --lib --test test_early_body_buffer_retry --no-fail-fast -- --test-threads=1


These pass in parallel for me, so --test-threads=1 doesn't look necessary. If it's there because of flakes, it's probably spawn_proxy_service binding port 0, dropping the listener and rebinding later, which can race. Can we also add a clippy run with early_body_buffer on? Right now none of this code gets linted in CI.

- fail custom upstreams on early-buffered bodies instead of sending a header with no body or end of stream - share upstream body selection through Session so h1, h2, and custom stop duplicating cfg blocks - send H2 100 Continue via h2 send_informational; the existing H2 path silently dropped 1xx headers - cap the Content-Length pre-size hint so a client cannot force a max_size (or aborting) allocation - require set_buffered_body callers to have consumed the downstream body, pinning H1 framing; make mark_body_buffered crate-private - return 408 from the total buffering deadline so the default fail_to_proxy does not map it to 400 - document that no upstream timeout backstops buffering; keep the opt-in deadline default - fix stale H2 termination docs, revert the error_while_proxy rename, drop the unrelated retry test double - add deterministic regressions for the allocation cap, custom rejection, and H2 Expect handling - lint the early_body_buffer lane in CI and run its tests in parallel

CodyPubNub · 2026-10-06T17:05:25Z

@zaidoon1 Thanks again for another careful pass. I've pushed the fixes in 51d618b. A few things that aren't obvious from the diff:

Checking H2 for Expect: 100-continue wasn't enough on its own. write_continue_response() was a no-op for H2, because the H2 server drops all 1xx headers, so it now sends the 100 via h2's send_informational(). The new regression test waits for that 100 before sending the body.
I kept the buffering deadline default at None, since it was requested as optional, and documented the gap instead: there's no upstream timeout to fall back on here, H2 body reads have no per-read timeout, and H1's timeout resets on every read. So apps that enable buffering should set a finite deadline.
set_buffered_body() now returns Result<()> and fails unless the downstream body has been fully read.
I dropped --test-threads=1. You're right that spawn_proxy_service can still race between dropping the probe listener and the server rebinding. I've left that as a known test harness limitation for a separate follow-up.
Heads up that CI is failing in test_req_conflicting_content_length_rejected and test_req_malformed_stream_budget_exhausted with h2 0.4.20. I reproduced it locally: both fail on 0.4.20 and pass on 0.4.19. h2 now rejects conflicting Content-Length values before Pingora's accept path sees them, so those tests' expectations no longer hold. Upstream main has the same tests and resolves h2 the same way, so it'll hit this on its next run too. The pingora-memory-cache test_eviction failure in that run looks like an unrelated flake; this PR doesn't touch that crate, and the test passes for me when run on its own.

Please let me know if I missed anything. Thank you!

# Conflicts: # docs/user_guide/phase.md # pingora-proxy/src/proxy_custom.rs # pingora-proxy/src/proxy_h1.rs # pingora-proxy/src/proxy_h2.rs

- buffer after allow_spawning_subrequest and should_handle_downstream_abandonment so main's documented contract holds: the opt-in is decided right after early_request_filter succeeds - document the hook order on early_request_body_buffer_limit, and that buffering hooks must not read the downstream body themselves, including through a spawned subrequest - add a regression that observes handles_downstream_abandonment() from the buffering hook

- SaveBody(limit) assumed the downstream body was still unread; after early buffering it saw a finished body, cleared the subrequest's body headers, and sent nothing - keep the SaveBody path and send a retained non-empty body through send_body_to_pipe once the subrequest asks for input, so downstream modules filter it and the saved body captures their output with SaveBody's limit and truncation semantics - an empty buffered body leaves the downstream body done, as for a request without a body, so a subrequest that asks for input later is still read and watched normally - a subrequest that never reads its body gets nothing and leaves the saved body empty, as with a streamed body - add regressions for forwarding, the save limit, an empty body, module filtering with and without the abandonment opt-in, and a subrequest that never reads

- replace the custom-upstream rejection with the same forwarding contract as h1 and h2 - strip Expect after upstream_request_filter, since 100 Continue was answered locally - derive the header's end flag from the buffered body, not the original framing, so a filtered or replaced empty body ends the request on its header - skip an explicitly empty buffer, so the body writer is not finished after the header already ended the request - retries replay the retained body through upstream_body_source as on h1 and h2 - add custom-connector regressions for forwarding, retry replay, Expect, and both empty-body paths, and run them in the early_body_buffer CI lane

- the guard checked is_body_done(), which an H1 or subrequest read error also sets before the declared framing ends - an application that swallowed that error could store a partial body as fully consumed and forward it upstream - check is_body_complete() instead; automatic buffering already propagates the read error - add a regression for a Content-Length body cut short by EOF

…tlives - an attempt's initial body send raced the upstream write against downstream stream closure; a large replay blocked on upstream flow control lost to an already-reset client - for a complete body whose partial-write cache fill could still finish, including retries after recorded abandonment, the initial send then lost H2BodySendError.downstream_closed and failed the attempt instead of applying the loop's cache-fill policy - skip the race only for the initial send of a complete body while the cache supports streaming partial writes, matching the loop's wait_for_cache_fill at attempt start; the loop's next downstream read then applies upstream's policy without cutting a write short - initial-send error handling is otherwise unchanged: an incomplete retry buffer or an uncached replay still stops as soon as the client resets - decide after both request body filters, which may disable caching; streamed writes in the loop, including the final chunk, always race - this is upstream's replay path in every build: ordinary retry buffers take it with or without early_body_buffer or the abandonment opt-in - regressions cover retry buffers in both feature modes, early-buffered bodies, an incomplete retry buffer, and the loop's final streamed chunk; fail-fast cases use a stalled upstream and assert the closure watch's own error

CodyPubNub · 2026-10-20T22:49:02Z

Merged main at 623e163 and addressed the remaining gaps. These are separate commits so each change can be reviewed on its own:

07687b9 Merge only: conflict resolutions plus compile-required adaptation (git show --remerge-diff 07687b9). It adopts DownstreamStateMachine::for_proxy_attempt: Session::upstream_body_source() now returns (request_body_finished, buffer), so the h1, h2, and custom paths keep main's code apart from the body-source line. Merged, not rebased, to keep review history.
de6f798 Hook order: early buffering now runs after allow_spawning_subrequest() and should_handle_downstream_abandonment(), so main's documented "right after early_request_filter" contract holds. As a result, those two hooks no longer see the buffered body, and the buffering hooks can see the opt-in and the subrequest spawner. Could you confirm this is the order you want?
d34f4fa pipe_subrequest(SaveBody): a buffered body was silently dropped. It is now forwarded through downstream module filters and saved with the usual limit.
e590447 Custom upstreams: replaces the rejection with forwarding, Expect removal, and retry replay, tested with a custom connector modeled on tests/custom_cache_fill. @drcaramelsyrup, I know you offered to handle proxy_custom internally. Since main now has a custom-upstream test harness, I've included it here, but I'm happy to drop this commit if it conflicts with your internal patch.
63ea9d3 set_buffered_body(): now rejects a body whose read failed before its declared framing ended.
9a1f7fd H2 initial replay (affects all builds): a complete initial replay is no longer raced against client closure while a streaming partial-write fill can use it, so it no longer loses downstream_closed. The decision is made after the body filters, and other initial-send error handling is unchanged. This changes upstream's retry-buffer replay too, with or without early_body_buffer or the abandonment opt-in. Happy to split it into its own PR if you prefer.

CI is red for an unrelated reason: tokio 1.54 panics on BufStream read capacity 0 (#1059), the same as on main. Locally, on tokio 1.53.1:

clippy passes with early_body_buffer on and off, and fmt passes;
pingora-proxy lib tests pass in both modes: 213 with the feature, 197 without;
the test_early_body_buffer_retry (22) and test_early_body_buffer_custom (5) integration tests pass with the feature enabled.

I didn't run the OpenResty-based suites.

CodyPubNub added 4 commits February 16, 2026 11:21

Add body_routing example for early request body buffering

b50ad3f

Mark body read errors as downstream in buffer_request_body_early

42e909d

Simplify early body buffering read errors to use into_down()

56f9065

davidthing mentioned this pull request Feb 23, 2026

Support Early Request Body Access for Dynamic Upstream Peer Selection #780

Open

Merge remote-tracking branch 'upstream/main' into early-request-body-…

82642a1

…buffering # Conflicts: # pingora-proxy/src/lib.rs

johnhurt added the enhancement New feature or request label Mar 13, 2026

PiotrSikora reviewed Mar 17, 2026

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CodyPubNub added 2 commits March 16, 2026 23:15

PiotrSikora reviewed Mar 17, 2026

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CodyPubNub added 2 commits May 4, 2026 09:58

Merge branch 'main' into early-request-body-buffering

ba51f61

Gate early_body_buffer behind cargo feature

b2524b9

CodyPubNub mentioned this pull request Jun 8, 2026

Enhanced LLM reverse proxy based on Model Name routing #907

Closed

Merge branch 'main' into early-request-body-buffering

ae6d2d9

Merge branch 'main' into early-request-body-buffering

09c4360

CodyPubNub added 2 commits July 27, 2026 10:04

CodyPubNub requested a review from drcaramelsyrup September 3, 2026 16:57

CodyPubNub added 2 commits September 4, 2026 10:55

Fix zero-length buffered requests to H2 upstreams

6ba8a67

- avoid sending a second END_STREAM after empty requests complete on HEADERS - preserve explicit END_STREAM forwarding when filters remove a non-empty body - add regression coverage for Content-Length: 0 requests

Merge branch 'main' into early-request-body-buffering

a35f2cd

CodyPubNub added 2 commits September 10, 2026 09:07

Merge branch 'main' into early-request-body-buffering

898d4b3

zaidoon1 reviewed Sep 15, 2026

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mariojcr mentioned this pull request Sep 25, 2026

h1: body read buffer lives for the whole request and is 64 KiB regardless of Content-Length #1020

Open

jaredLunde mentioned this pull request Sep 30, 2026

bill cancelled streams, cap tenant concurrency, keep image URLs, Pingora 0.9 beyondoss/ai#109

Merged

zaidoon1 reviewed Oct 6, 2026

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CodyPubNub requested a review from zaidoon1 October 12, 2026 17:08

CodyPubNub added 6 commits October 20, 2026 14:27

Merge branch 'main' into early-request-body-buffering

07687b9

# Conflicts: # docs/user_guide/phase.md # pingora-proxy/src/proxy_custom.rs # pingora-proxy/src/proxy_h1.rs # pingora-proxy/src/proxy_h2.rs

		let capacity = content_length.unwrap_or(retained_size).max(retained_size);
		let mut body = bytes::BytesMut::with_capacity(capacity);

		/// before forwarding. Pingora emits HTTP/2 stream termination itself based on the downstream
		/// request rather than the chunks retained by this filter.

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Standard streaming / non-buffered:

Buffered / deferred headers:

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