net/http: Connection reset on file upload

[0tanay]

Go version

go version go1.23.4 linux/amd64

Output of go env in your module/workspace:

GO111MODULE=''
GOARCH='amd64'
GOBIN=''
GOCACHE='/home/tanay/.cache/go-build'
GOENV='/home/tanay/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMODCACHE='/home/tanay/go/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/home/tanay/go'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/lib/go'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/lib/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.23.4'
GODEBUG=''
GOTELEMETRY='local'
GOTELEMETRYDIR='/home/tanay/.config/go/telemetry'
GCCGO='gccgo'
GOAMD64='v1'
AR='ar'
CC='gcc'
CXX='g++'
CGO_ENABLED='1'
GOMOD='/dev/null'
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build2736456403=/tmp/go-build -gno-record-gcc-switches'

What did you do?

https://go.dev/play/p/Td2zJWsHagm

Uploaded a file of size > 10MiB through the web form on:

• localhost:8080/case/1/
• localhost:8080/case/2/

What did you see happen?

The handler Case1 closes the connection without sending any response - either through http.Error() or w.WriteHeader().

When the same file is uploaded, the Case2 handler returns the correct error response. It looks like the only difference is the call to ParseMultipartForm() before sending a reply.

What did you expect to see?

The Case1 handler should return an HTTP response with status code 200 or 500.

[gabyhelp]

Related Issues

• "The connection was reset" error when uploading a ~10MB file #68715 (closed)
• net/http: #62547 (closed)
• net/http: HTTP large file upload fails with "bufio: buffer full" #26707 (closed)
• net/http: HTTP/2 request context sometimes returns no error when the client disconnects #52183
• x/net/http2: response Write on HEAD fails with "http2: request body closed due to handler exiting" #66812
• net/http: should get "ok" but get no response #23336 (closed)
• affected/package: http server shut down #50752 (closed)
• net/http: ParseMultipartForm panic when the body==nil #48206 (closed)

Related Discussions

• Why do I get "The connection was reset" error when uploading a ~10MB file, and how to avoid reading the file into memory?
• Errors with uploading large files (> 1gb) - multipart

_{(Emoji vote if this was helpful or unhelpful; more detailed feedback welcome in this discussion.)}

[seankhliao]

see the above links, the connection is broken on a lower level because of full buffers.

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