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reverseproxy: Ignore context cancel in stream mode (#4952)
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1 changed files with 27 additions and 0 deletions
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@ -109,6 +109,11 @@ type Handler struct {
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// response is recognized as a streaming response, or if its
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// content length is -1; for such responses, writes are flushed
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// to the client immediately.
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//
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// Normally, a request will be canceled if the client disconnects
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// before the response is received from the backend. If explicitly
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// set to -1, client disconnection will be ignored and the request
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// will be completed to help facilitate low-latency streaming.
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FlushInterval caddy.Duration `json:"flush_interval,omitempty"`
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// A list of IP ranges (supports CIDR notation) from which
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@ -757,6 +762,15 @@ func (h *Handler) reverseProxy(rw http.ResponseWriter, req *http.Request, origRe
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req = req.WithContext(httptrace.WithClientTrace(req.Context(), trace))
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}
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// if FlushInterval is explicitly configured to -1 (i.e. flush continuously to achieve
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// low-latency streaming), don't let the transport cancel the request if the client
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// disconnects: user probably wants us to finish sending the data to the upstream
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// regardless, and we should expect client disconnection in low-latency streaming
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// scenarios (see issue #4922)
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if h.FlushInterval == -1 {
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req = req.WithContext(ignoreClientGoneContext{req.Context(), h.ctx.Done()})
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}
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// do the round-trip; emit debug log with values we know are
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// safe, or if there is no error, emit fuller log entry
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start := time.Now()
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@ -1374,6 +1388,19 @@ type handleResponseContext struct {
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isFinalized bool
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}
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// ignoreClientGoneContext is a special context.Context type
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// intended for use when doing a RoundTrip where you don't
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// want a client disconnection to cancel the request during
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// the roundtrip. Set its done field to a Done() channel
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// of a context that doesn't get canceled when the client
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// disconnects, such as caddy.Context.Done() instead.
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type ignoreClientGoneContext struct {
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context.Context
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done <-chan struct{}
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}
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func (c ignoreClientGoneContext) Done() <-chan struct{} { return c.done }
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// proxyHandleResponseContextCtxKey is the context key for the active proxy handler
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// so that handle_response routes can inherit some config options
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// from the proxy handler.
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