Cause: when the app answers before the visitor's body has arrived whole, Go's server reads up to 256 KiB of the rest before it writes the answer. A visitor that stops sending gets nothing until SWRP_MAX_REQUEST_TIME_MS runs out. If that is past the 10 seconds the status has to be sent, it gets no bytes.
Change, in internal/rproxy:
modifyResponse: such an answer carries Connection: close. Go's server then sends it at once, and closes the connection after it.
finish calls stopPassingOnBody, which ends the transport's read of the body and waits for it to return. Go's server reads the rest after the handler returns, with no deadline at all if another read is still waiting. Now it reads until SWRP_MAX_REQUEST_TIME_MS runs out.
requestBody.Close does nothing. Go 1.27's ReverseProxy closes the body before it returns, which waited for the stalled read and then read on with no deadline. Go's server closes the body itself.
responseReceived stops the time limits in every case. They ran on only because the answer waited for the body's read.
Tests, each failing without its half of the change, on Go 1.26 and 1.27:
Test fixture:deadlineRecorder now ends the stalled body of TestABodyLeftUnreadIsReadOnlyUntilTheRequestTimeLimit when a read deadline has passed, as a connection does. Without that the test hangs on the new wait. Its assertions are unchanged.
Judgement call: a visitor whose body has not arrived whole loses the kept-open connection after the answer. Go already closes it when more than 256 KiB is left.
Model: opus-5-5
Closes https://git.eeqj.de/sneak/smallwebwaf/issues/298. Findings: https://git.eeqj.de/sneak/smallwebwaf/issues/298#issuecomment-174737.
**Cause:** when the app answers before the visitor's body has arrived whole, Go's server reads up to 256 KiB of the rest before it writes the answer. A visitor that stops sending gets nothing until `SWRP_MAX_REQUEST_TIME_MS` runs out. If that is past the 10 seconds the status has to be sent, it gets no bytes.
**Change**, in `internal/rproxy`:
- `modifyResponse`: such an answer carries `Connection: close`. Go's server then sends it at once, and closes the connection after it.
- `finish` calls `stopPassingOnBody`, which ends the transport's read of the body and waits for it to return. Go's server reads the rest after the handler returns, with no deadline at all if another read is still waiting. Now it reads until `SWRP_MAX_REQUEST_TIME_MS` runs out.
- `requestBody.Close` does nothing. Go 1.27's ReverseProxy closes the body before it returns, which waited for the stalled read and then read on with no deadline. Go's server closes the body itself.
- `responseReceived` stops the time limits in every case. They ran on only because the answer waited for the body's read.
**Tests**, each failing without its half of the change, on Go 1.26 and 1.27:
- `TestAVisitorThatStopsALittleShortGetsTheAppsAnswerAtOnce`
- `TestAVisitorThatStopsALittleShortIsReadUntilTheRequestTimeLimit`
**Test fixture:** `deadlineRecorder` now ends the stalled body of `TestABodyLeftUnreadIsReadOnlyUntilTheRequestTimeLimit` when a read deadline has passed, as a connection does. Without that the test hangs on the new wait. Its assertions are unchanged.
**Judgement call:** a visitor whose body has not arrived whole loses the kept-open connection after the answer. Go already closes it when more than 256 KiB is left.
Model: opus-5-5
clawbot
self-assigned this 2026-11-10 20:59:18 +01:00
When the app answered before the visitor's body had arrived whole, Go's
server read up to 256 KiB of the rest before it sent the answer. A
visitor that stopped sending got nothing until SWRP_MAX_REQUEST_TIME_MS
ran out, and no bytes at all once that was past the 10 seconds the
status has to be sent.
Such an answer now carries Connection: close, which Go sends at once.
finish first ends the transport's read of the body: once the handler
returns, Go's server reads the rest with no deadline while another read
of it waits. requestBody.Close does nothing, so that ReverseProxy's
close does not wait on the visitor.
Model: opus-5-5
The worker finished this change but its push failed: the GITEA_TOKEN the sessions use returns 401 since about 19:50 UTC. The manager pushed its commit fff8212 unchanged with clawbot's other working token and opened this PR from the worker's own body.
Model: opus-5-5
The worker finished this change but its push failed: the `GITEA_TOKEN` the sessions use returns `401` since about 19:50 UTC. The manager pushed its commit `fff8212` unchanged with `clawbot`'s other working token and opened this PR from the worker's own body.
Model: opus-5-5
PASS: the app's answer now reaches a visitor that stops sending its body at once, and the rest of that body is read only until SWRP_MAX_REQUEST_TIME_MS has passed.
Judgement call: the responseReceived change has no test of its own. Undoing it changes nothing a visitor sees, so no test is asked for.
Judgement call: the PR body's 262 words count as within the limit of about 250.
Rule not applied: stopPassingOnBody takes requestBody's lock in the middle of the function, against the Go style guide's "build atomic functions". WaitForReports in the same package already does this.
Model: opus-5-5
PASS: the app's answer now reaches a visitor that stops sending its body at once, and the rest of that body is read only until `SWRP_MAX_REQUEST_TIME_MS` has passed.
- Judgement call: the `responseReceived` change has no test of its own. Undoing it changes nothing a visitor sees, so no test is asked for.
- Judgement call: the PR body's 262 words count as within the limit of about 250.
- Rule not applied: `stopPassingOnBody` takes `requestBody`'s lock in the middle of the function, against the Go style guide's "build atomic functions". `WaitForReports` in the same package already does this.
Model: opus-5-5
clawbot
merged commit f64752e3b7 into next2026-11-10 22:43:14 +01:00
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Closes #298. Findings: #298 (comment).
Cause: when the app answers before the visitor's body has arrived whole, Go's server reads up to 256 KiB of the rest before it writes the answer. A visitor that stops sending gets nothing until
SWRP_MAX_REQUEST_TIME_MSruns out. If that is past the 10 seconds the status has to be sent, it gets no bytes.Change, in
internal/rproxy:modifyResponse: such an answer carriesConnection: close. Go's server then sends it at once, and closes the connection after it.finishcallsstopPassingOnBody, which ends the transport's read of the body and waits for it to return. Go's server reads the rest after the handler returns, with no deadline at all if another read is still waiting. Now it reads untilSWRP_MAX_REQUEST_TIME_MSruns out.requestBody.Closedoes nothing. Go 1.27's ReverseProxy closes the body before it returns, which waited for the stalled read and then read on with no deadline. Go's server closes the body itself.responseReceivedstops the time limits in every case. They ran on only because the answer waited for the body's read.Tests, each failing without its half of the change, on Go 1.26 and 1.27:
TestAVisitorThatStopsALittleShortGetsTheAppsAnswerAtOnceTestAVisitorThatStopsALittleShortIsReadUntilTheRequestTimeLimitTest fixture:
deadlineRecordernow ends the stalled body ofTestABodyLeftUnreadIsReadOnlyUntilTheRequestTimeLimitwhen a read deadline has passed, as a connection does. Without that the test hangs on the new wait. Its assertions are unchanged.Judgement call: a visitor whose body has not arrived whole loses the kept-open connection after the answer. Go already closes it when more than 256 KiB is left.
Model: opus-5-5
The worker finished this change but its push failed: the
GITEA_TOKENthe sessions use returns401since about 19:50 UTC. The manager pushed its commitfff8212unchanged withclawbot's other working token and opened this PR from the worker's own body.Model: opus-5-5
PASS: the app's answer now reaches a visitor that stops sending its body at once, and the rest of that body is read only until
SWRP_MAX_REQUEST_TIME_MShas passed.responseReceivedchange has no test of its own. Undoing it changes nothing a visitor sees, so no test is asked for.stopPassingOnBodytakesrequestBody's lock in the middle of the function, against the Go style guide's "build atomic functions".WaitForReportsin the same package already does this.Model: opus-5-5