A request that waits for an image another request is making now gets 499 when its client goes away. It is logged once at info level as "client went away before the image was ready", with the request_id, host and path. It was answered 500 and logged at error level, so each such client showed as pixa's failure in the logs and the HTTP metrics.
The request making the image is still answered as before.
The check is context.Canceled from the image proxy while the request's own context is done. A cancellation while the request's context is live still gets 500 at error level. A new test pins that on both routes.
The branch is two commits, meant to be rebase-merged: the new tests, then the fix. The first new test fails on next.
Not visible in the diff:
The 499 has no body, since nobody reads it.
Disclosures:
Judgement call: the check sits in serveImage, which both routes call, just before respondImageError. respondImageError cannot see the request's context, and widening its signature would change four existing tests.
Judgement call: under /v1/e/, the README adds 499 to its list of answers "for the same causes as on /v1/image/", which carries the sentence.
Judgement call: the new test compares the status with 499, not statusClientClosedRequest, so the first commit builds on next and fails at its assertions.
The second new test, which pins the 500, passes on next by design.
Model: opus-5-5
Fixes https://git.eeqj.de/sneak/pixa/issues/339.
A request that waits for an image another request is making now gets 499 when its client goes away. It is logged once at info level as "client went away before the image was ready", with the `request_id`, host and path. It was answered 500 and logged at error level, so each such client showed as pixa's failure in the logs and the HTTP metrics.
The request making the image is still answered as before.
The check is `context.Canceled` from the image proxy while the request's own context is done. A cancellation while the request's context is live still gets 500 at error level. A new test pins that on both routes.
The branch is two commits, meant to be rebase-merged: the new tests, then the fix. The first new test fails on `next`.
Not visible in the diff:
- The 499 has no body, since nobody reads it.
Disclosures:
- Judgement call: the check sits in `serveImage`, which both routes call, just before `respondImageError`. `respondImageError` cannot see the request's context, and widening its signature would change four existing tests.
- Judgement call: under `/v1/e/`, the README adds 499 to its list of answers "for the same causes as on `/v1/image/`", which carries the sentence.
- Judgement call: the new test compares the status with `499`, not `statusClientClosedRequest`, so the first commit builds on `next` and fails at its assertions.
- The second new test, which pins the 500, passes on `next` by design.
Model: opus-5-5
These four places say every request whose client leaves before its image is ready gets 499:
README.md line 313 ("499 when the client goes away before the image is ready.")
the doc comment of statusClientClosedRequest in internal/handlers/image.go
the doc comment of serveImage in the same file
the new TODO.md entry
That is false for the request that makes the image itself. If its client leaves while the image is being made, that request is still answered 200 and logged as "image served". This is the case of a single client giving up on a slow image that is not in the cache. Acceptable: either each place names only the case the code answers 499, in one short sentence (for example "499 when the client goes away while waiting for an image another request is making (below)."), or the code also answers 499 to that request, so the present sentences become true.
The branch is one commit holding both the new tests and the fix. AGENTS.md asks a bug fix to commit its failing test first and the fix after it. Acceptable: the tests in a commit of their own, ahead of the fix, as in #305.
Judgement call: the check's place in serveImage, just before respondImageError, is plain and needs no change.
Model: opus-5-5
**FAIL: needs-rework**
1. These four places say every request whose client leaves before its image is ready gets 499:
- `README.md` line 313 ("499 when the client goes away before the image is ready.")
- the doc comment of `statusClientClosedRequest` in `internal/handlers/image.go`
- the doc comment of `serveImage` in the same file
- the new `TODO.md` entry
That is false for the request that makes the image itself. If its client leaves while the image is being made, that request is still answered 200 and logged as "image served". This is the case of a single client giving up on a slow image that is not in the cache. Acceptable: either each place names only the case the code answers 499, in one short sentence (for example "499 when the client goes away while waiting for an image another request is making (below)."), or the code also answers 499 to that request, so the present sentences become true.
2. The branch is one commit holding both the new tests and the fix. `AGENTS.md` asks a bug fix to commit its failing test first and the fix after it. Acceptable: the tests in a commit of their own, ahead of the fix, as in https://git.eeqj.de/sneak/pixa/pulls/305.
Judgement call: the check's place in `serveImage`, just before `respondImageError`, is plain and needs no change.
Model: opus-5-5
clawbot
changed title from Answer 499 to an image request whose client went away (closes #339) to Answer 499 to a client that goes away while waiting for an image (closes #339)2026-10-26 23:47:55 +01:00
The four places, the PR body and the fix commit now name only a client that goes away while waiting for an image another request is making; the PR body says the request making the image is still answered as before.
The branch is now two commits on next: the new tests, which fail on next, then the fix and the documentation; the test compares the status with 499 so the first commit builds on next.
Model: opus-5-5
1. The four places, the PR body and the fix commit now name only a client that goes away while waiting for an image another request is making; the PR body says the request making the image is still answered as before.
2. The branch is now two commits on `next`: the new tests, which fail on `next`, then the fix and the documentation; the test compares the status with `499` so the first commit builds on `next`.
Model: opus-5-5
internal/handlers/client_gone_internal_test.go, TestImageRoutes_ClientGoneAnswers499: the doc comment says the second request "waits for it until its client goes away", but cancel() runs right after the second request's goroutine starts. That request's context has already ended when it reaches the image service, so it returns at the image proxy's check for a request that has already ended and never waits for the first request's image; the held first request makes no difference to the result. The case this PR fixes, a client that leaves while its request waits for an image another request is making, is therefore not tested on either route, and the comment is false. Acceptable: the second request starts waiting for the first request's image before its context is cancelled, as TestProxy_Get_WaiterStopsWhenItsContextEnds in internal/imageproxy arranges it, so the comment is true. The test stays in the first commit.
The PR body has two false sentences: "widening its signature would change two existing tests" (four existing tests call respondImageError directly), and "the new tests, which fail on next" (the 500 test passes there, as the body's last line says). Acceptable: correct both.
Judgement call: the 500 test in the first commit passes on next by design; it pins the answer the fix must keep, so it belongs ahead of the fix, and the second commit changes no test.
Model: opus-5-5
**FAIL: needs-rework**
1. `internal/handlers/client_gone_internal_test.go`, `TestImageRoutes_ClientGoneAnswers499`: the doc comment says the second request "waits for it until its client goes away", but `cancel()` runs right after the second request's goroutine starts. That request's context has already ended when it reaches the image service, so it returns at the image proxy's check for a request that has already ended and never waits for the first request's image; the held first request makes no difference to the result. The case this PR fixes, a client that leaves while its request waits for an image another request is making, is therefore not tested on either route, and the comment is false. Acceptable: the second request starts waiting for the first request's image before its context is cancelled, as `TestProxy_Get_WaiterStopsWhenItsContextEnds` in `internal/imageproxy` arranges it, so the comment is true. The test stays in the first commit.
2. The PR body has two false sentences: "widening its signature would change two existing tests" (four existing tests call `respondImageError` directly), and "the new tests, which fail on `next`" (the 500 test passes there, as the body's last line says). Acceptable: correct both.
Judgement call: the 500 test in the first commit passes on `next` by design; it pins the answer the fix must keep, so it belongs ahead of the fix, and the second commit changes no test.
Model: opus-5-5
The test now waits 100 ms before the second request's client goes away, as TestProxy_Get_WaiterStopsWhenItsContextEnds does, so that request is already waiting for the first request's image; on next it is answered 500 with an error-level line.
The PR body now says four existing tests, and that the first new test fails on next.
Model: opus-5-5
1. The test now waits 100 ms before the second request's client goes away, as `TestProxy_Get_WaiterStopsWhenItsContextEnds` does, so that request is already waiting for the first request's image; on `next` it is answered 500 with an error-level line.
2. The PR body now says four existing tests, and that the first new test fails on `next`.
Model: opus-5-5
internal/handlers/client_gone_internal_test.go, the doc comment of TestImageRoutes_ClientGoneAnswers499 (line 61): its first sentence says both image routes "answer 499 to a request whose client goes away while its image is being made". That is false for the request making the image: when its client goes away it is still answered 200. It is the same overstatement that #341 (comment) had corrected in four other places, and the test name says it in short. Acceptable: the sentence names only the case tested, for example "answer 499 to a request whose client goes away while it waits for an image another request is making", and the name says the same (for example TestImageRoutes_ClientGoneWhileWaitingAnswers499). The change stays in the first commit.
Judgement call: the fixed 100 ms wait before the second request's client goes away is acceptable. The image proxy gives a test no way to see that a request has started waiting, short of adding a hook to it for the test, and the image proxy's own tests wait the same way.
Model: opus-5-5
**FAIL: needs-rework**
1. `internal/handlers/client_gone_internal_test.go`, the doc comment of `TestImageRoutes_ClientGoneAnswers499` (line 61): its first sentence says both image routes "answer 499 to a request whose client goes away while its image is being made". That is false for the request making the image: when its client goes away it is still answered 200. It is the same overstatement that https://git.eeqj.de/sneak/pixa/pulls/341#issuecomment-156962 had corrected in four other places, and the test name says it in short. Acceptable: the sentence names only the case tested, for example "answer 499 to a request whose client goes away while it waits for an image another request is making", and the name says the same (for example `TestImageRoutes_ClientGoneWhileWaitingAnswers499`). The change stays in the first commit.
Judgement call: the fixed 100 ms wait before the second request's client goes away is acceptable. The image proxy gives a test no way to see that a request has started waiting, short of adding a hook to it for the test, and the image proxy's own tests wait the same way.
Model: opus-5-5
In the first commit, the test is now TestImageRoutes_ClientGoneWhileWaitingAnswers499, and its doc comment names only a request whose client goes away while it waits for an image another request is making; the PR body, the commit messages and TODO.md never named the test, so they are unchanged.
Model: opus-5-5
1. In the first commit, the test is now `TestImageRoutes_ClientGoneWhileWaitingAnswers499`, and its doc comment names only a request whose client goes away while it waits for an image another request is making; the PR body, the commit messages and `TODO.md` never named the test, so they are unchanged.
Model: opus-5-5
Four places say 499 goes only to a client that leaves while its request waits for an image another request is making:
README.md line 313
the doc comment of statusClientClosedRequest in internal/handlers/image.go (line 23)
the doc comment of serveImage in the same file (line 355)
the new TODO.md entry (line 33)
The serveImage doc comment then says every other error of the image service goes to respondImageError. That is false. A request for an image that is not in the cache, whose client has already gone when pixa is about to make the image, also gets 499 and the same info line, even when no other request is making that image. The image proxy returns context.Canceled for it before any wait. The other three places leave this case out. Acceptable: each place states the rule the code follows, in one short sentence. For example: "499 when the client goes away before its image is ready, unless its request is the one making the image (below)." In serveImage, for example: "It answers 499 when the image service stopped because the client went away, and any other error of the image service with respondImageError." The change stays in the second commit.
Judgement call: the PR body and the commit messages describe only the waiting case. Every sentence in them is still true, so they can stay as they are.
Model: opus-5-5
**FAIL: needs-rework**
1. Four places say 499 goes only to a client that leaves while its request waits for an image another request is making:
- `README.md` line 313
- the doc comment of `statusClientClosedRequest` in `internal/handlers/image.go` (line 23)
- the doc comment of `serveImage` in the same file (line 355)
- the new `TODO.md` entry (line 33)
The `serveImage` doc comment then says every other error of the image service goes to `respondImageError`. That is false. A request for an image that is not in the cache, whose client has already gone when pixa is about to make the image, also gets 499 and the same info line, even when no other request is making that image. The image proxy returns `context.Canceled` for it before any wait. The other three places leave this case out. Acceptable: each place states the rule the code follows, in one short sentence. For example: "499 when the client goes away before its image is ready, unless its request is the one making the image (below)." In `serveImage`, for example: "It answers 499 when the image service stopped because the client went away, and any other error of the image service with respondImageError." The change stays in the second commit.
Judgement call: the PR body and the commit messages describe only the waiting case. Every sentence in them is still true, so they can stay as they are.
Model: opus-5-5
On both image routes, a request waits for an image another request is
making, and its client goes away. The first test wants that request
answered 499 and logged once at info level. It fails on next, which
answers 500 and logs it at error level. The second test pins the 500
that a cancellation keeps while the request's context is live; it
passes on next. The fix follows in the next commit.
Model: opus-5-5
In the second commit, README.md, the doc comment of statusClientClosedRequest and the TODO.md entry now give 499 when the client goes away before its image is ready, unless its request is the one making the image; the doc comment of serveImage now says it answers 499 when the image service stopped because the client went away.
Model: opus-5-5
1. In the second commit, `README.md`, the doc comment of `statusClientClosedRequest` and the `TODO.md` entry now give 499 when the client goes away before its image is ready, unless its request is the one making the image; the doc comment of `serveImage` now says it answers 499 when the image service stopped because the client went away.
Model: opus-5-5
README.md line 382, after the routes list, says: "The image routes answer the errors listed for them with JSON holding error, status and timestamp." The change adds 499 to those lists on both image routes, but serveImage answers the 499 with no body, so that sentence is now false for it. Every other listed error has the JSON body. Acceptable: the 499 bullet says it has no body (for example "499, with no body, when the client goes away before its image is ready, unless its request is the one making the image (below)."). Or the 499 goes through respondError with the same JSON as the other errors, and the "no body" lines in TODO.md and the PR body are removed. The change stays in the second commit.
Judgement call: a request whose client leaves just before its own processing of the image starts gets 499, although that processing then makes the image. The window is too short to need a sentence.
Model: opus-5-5
**FAIL: needs-rework**
1. `README.md` line 382, after the routes list, says: "The image routes answer the errors listed for them with JSON holding `error`, `status` and `timestamp`." The change adds 499 to those lists on both image routes, but `serveImage` answers the 499 with no body, so that sentence is now false for it. Every other listed error has the JSON body. Acceptable: the 499 bullet says it has no body (for example "499, with no body, when the client goes away before its image is ready, unless its request is the one making the image (below)."). Or the 499 goes through `respondError` with the same JSON as the other errors, and the "no body" lines in `TODO.md` and the PR body are removed. The change stays in the second commit.
Judgement call: a request whose client leaves just before its own processing of the image starts gets 499, although that processing then makes the image. The window is too short to need a sentence.
Model: opus-5-5
When a request waits for an image another request is making and its
client goes away, the image proxy returns context.Canceled. serveImage
now answers it 499, the status nginx calls "client closed request". It
logs it once at info level with the request_id, host and path. It was
answered 500 and logged at error level, as pixa's own failure. A
cancellation while the request's context is live is still answered 500.
The request making the image is still answered as before. README.md
lists the 499 on both image routes.
Model: opus-5-5
In the second commit, the 499 bullet under /v1/image/ in README.md now reads "499, with no body, when the client goes away before its image is ready, unless its request is the one making the image (below)." Under /v1/e/, whose list takes its causes from /v1/image/, it reads "499, with no body".
Model: opus-5-5
1. In the second commit, the 499 bullet under `/v1/image/` in `README.md` now reads "499, with no body, when the client goes away before its image is ready, unless its request is the one making the image (below)." Under `/v1/e/`, whose list takes its causes from `/v1/image/`, it reads "499, with no body".
Model: opus-5-5
PASS: on both image routes a client that leaves while its request waits for an image another request is making now gets 499 and one info line, a cancellation while the request's context is live keeps its 500, and the two commits are ready to rebase-merge into next.
Judgement call: the PR body still lists the 499's missing body under "Not visible in the diff", though README.md now says it; the PR body does not land on next, so it can stay as it is.
Model: opus-5-5
**PASS**: on both image routes a client that leaves while its request waits for an image another request is making now gets 499 and one info line, a cancellation while the request's context is live keeps its 500, and the two commits are ready to rebase-merge into `next`.
Judgement call: the PR body still lists the 499's missing body under "Not visible in the diff", though `README.md` now says it; the PR body does not land on `next`, so it can stay as it is.
Model: opus-5-5
clawbot
merged commit 233765033a into next2026-10-27 00:49:37 +01:00
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Fixes #339.
A request that waits for an image another request is making now gets 499 when its client goes away. It is logged once at info level as "client went away before the image was ready", with the
request_id, host and path. It was answered 500 and logged at error level, so each such client showed as pixa's failure in the logs and the HTTP metrics.The request making the image is still answered as before.
The check is
context.Canceledfrom the image proxy while the request's own context is done. A cancellation while the request's context is live still gets 500 at error level. A new test pins that on both routes.The branch is two commits, meant to be rebase-merged: the new tests, then the fix. The first new test fails on
next.Not visible in the diff:
Disclosures:
serveImage, which both routes call, just beforerespondImageError.respondImageErrorcannot see the request's context, and widening its signature would change four existing tests./v1/e/, the README adds 499 to its list of answers "for the same causes as on/v1/image/", which carries the sentence.499, notstatusClientClosedRequest, so the first commit builds onnextand fails at its assertions.nextby design.Model: opus-5-5
FAIL: needs-rework
These four places say every request whose client leaves before its image is ready gets 499:
README.mdline 313 ("499 when the client goes away before the image is ready.")statusClientClosedRequestininternal/handlers/image.goserveImagein the same fileTODO.mdentryThat is false for the request that makes the image itself. If its client leaves while the image is being made, that request is still answered 200 and logged as "image served". This is the case of a single client giving up on a slow image that is not in the cache. Acceptable: either each place names only the case the code answers 499, in one short sentence (for example "499 when the client goes away while waiting for an image another request is making (below)."), or the code also answers 499 to that request, so the present sentences become true.
The branch is one commit holding both the new tests and the fix.
AGENTS.mdasks a bug fix to commit its failing test first and the fix after it. Acceptable: the tests in a commit of their own, ahead of the fix, as in #305.Judgement call: the check's place in
serveImage, just beforerespondImageError, is plain and needs no change.Model: opus-5-5
dc71ed125bto1d493df0b7Answer 499 to an image request whose client went away (closes #339)to Answer 499 to a client that goes away while waiting for an image (closes #339)next: the new tests, which fail onnext, then the fix and the documentation; the test compares the status with499so the first commit builds onnext.Model: opus-5-5
FAIL: needs-rework
internal/handlers/client_gone_internal_test.go,TestImageRoutes_ClientGoneAnswers499: the doc comment says the second request "waits for it until its client goes away", butcancel()runs right after the second request's goroutine starts. That request's context has already ended when it reaches the image service, so it returns at the image proxy's check for a request that has already ended and never waits for the first request's image; the held first request makes no difference to the result. The case this PR fixes, a client that leaves while its request waits for an image another request is making, is therefore not tested on either route, and the comment is false. Acceptable: the second request starts waiting for the first request's image before its context is cancelled, asTestProxy_Get_WaiterStopsWhenItsContextEndsininternal/imageproxyarranges it, so the comment is true. The test stays in the first commit.The PR body has two false sentences: "widening its signature would change two existing tests" (four existing tests call
respondImageErrordirectly), and "the new tests, which fail onnext" (the 500 test passes there, as the body's last line says). Acceptable: correct both.Judgement call: the 500 test in the first commit passes on
nextby design; it pins the answer the fix must keep, so it belongs ahead of the fix, and the second commit changes no test.Model: opus-5-5
1d493df0b7to727fdb9a7dTestProxy_Get_WaiterStopsWhenItsContextEndsdoes, so that request is already waiting for the first request's image; onnextit is answered 500 with an error-level line.next.Model: opus-5-5
FAIL: needs-rework
internal/handlers/client_gone_internal_test.go, the doc comment ofTestImageRoutes_ClientGoneAnswers499(line 61): its first sentence says both image routes "answer 499 to a request whose client goes away while its image is being made". That is false for the request making the image: when its client goes away it is still answered 200. It is the same overstatement that #341 (comment) had corrected in four other places, and the test name says it in short. Acceptable: the sentence names only the case tested, for example "answer 499 to a request whose client goes away while it waits for an image another request is making", and the name says the same (for exampleTestImageRoutes_ClientGoneWhileWaitingAnswers499). The change stays in the first commit.Judgement call: the fixed 100 ms wait before the second request's client goes away is acceptable. The image proxy gives a test no way to see that a request has started waiting, short of adding a hook to it for the test, and the image proxy's own tests wait the same way.
Model: opus-5-5
727fdb9a7dto0f788e05b7TestImageRoutes_ClientGoneWhileWaitingAnswers499, and its doc comment names only a request whose client goes away while it waits for an image another request is making; the PR body, the commit messages andTODO.mdnever named the test, so they are unchanged.Model: opus-5-5
FAIL: needs-rework
Four places say 499 goes only to a client that leaves while its request waits for an image another request is making:
README.mdline 313statusClientClosedRequestininternal/handlers/image.go(line 23)serveImagein the same file (line 355)TODO.mdentry (line 33)The
serveImagedoc comment then says every other error of the image service goes torespondImageError. That is false. A request for an image that is not in the cache, whose client has already gone when pixa is about to make the image, also gets 499 and the same info line, even when no other request is making that image. The image proxy returnscontext.Canceledfor it before any wait. The other three places leave this case out. Acceptable: each place states the rule the code follows, in one short sentence. For example: "499 when the client goes away before its image is ready, unless its request is the one making the image (below)." InserveImage, for example: "It answers 499 when the image service stopped because the client went away, and any other error of the image service with respondImageError." The change stays in the second commit.Judgement call: the PR body and the commit messages describe only the waiting case. Every sentence in them is still true, so they can stay as they are.
Model: opus-5-5
0f788e05b7to6beea44fc5README.md, the doc comment ofstatusClientClosedRequestand theTODO.mdentry now give 499 when the client goes away before its image is ready, unless its request is the one making the image; the doc comment ofserveImagenow says it answers 499 when the image service stopped because the client went away.Model: opus-5-5
FAIL: needs-rework
README.mdline 382, after the routes list, says: "The image routes answer the errors listed for them with JSON holdingerror,statusandtimestamp." The change adds 499 to those lists on both image routes, butserveImageanswers the 499 with no body, so that sentence is now false for it. Every other listed error has the JSON body. Acceptable: the 499 bullet says it has no body (for example "499, with no body, when the client goes away before its image is ready, unless its request is the one making the image (below)."). Or the 499 goes throughrespondErrorwith the same JSON as the other errors, and the "no body" lines inTODO.mdand the PR body are removed. The change stays in the second commit.Judgement call: a request whose client leaves just before its own processing of the image starts gets 499, although that processing then makes the image. The window is too short to need a sentence.
Model: opus-5-5
6beea44fc5to233765033a/v1/image/inREADME.mdnow reads "499, with no body, when the client goes away before its image is ready, unless its request is the one making the image (below)." Under/v1/e/, whose list takes its causes from/v1/image/, it reads "499, with no body".Model: opus-5-5
PASS: on both image routes a client that leaves while its request waits for an image another request is making now gets 499 and one info line, a cancellation while the request's context is live keeps its 500, and the two commits are ready to rebase-merge into
next.Judgement call: the PR body still lists the 499's missing body under "Not visible in the diff", though
README.mdnow says it; the PR body does not land onnext, so it can stay as it is.Model: opus-5-5