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Ensure responses are context.ResponseWriters (#19843)
In order for web.Wrap to be able to detect if a response has been written we need to wrap any non-context.ResponseWriters as a such. Otherwise responses will be incorrectly detected as non-written to and handlers can double run. In the case of GZip this handler will change the response to a non-context.RW and this failure to correctly detect response writing causes fallthrough and a NPE. Fix #19839 Signed-off-by: Andrew Thornton <art27@cantab.net>
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@ -21,6 +21,9 @@ func convertHandler(handler interface{}) wrappedHandlerFunc {
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case http.HandlerFunc:
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return func(resp http.ResponseWriter, req *http.Request, others ...wrappedHandlerFunc) (done bool, deferrable func()) {
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routing.UpdateFuncInfo(req.Context(), funcInfo)
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if _, ok := resp.(context.ResponseWriter); !ok {
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resp = context.NewResponse(resp)
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}
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t(resp, req)
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if r, ok := resp.(context.ResponseWriter); ok && r.Status() > 0 {
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done = true
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@ -92,6 +95,9 @@ func convertHandler(handler interface{}) wrappedHandlerFunc {
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next = wrapInternal(others)
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}
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routing.UpdateFuncInfo(req.Context(), funcInfo)
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if _, ok := resp.(context.ResponseWriter); !ok {
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resp = context.NewResponse(resp)
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}
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t(next).ServeHTTP(resp, req)
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if r, ok := resp.(context.ResponseWriter); ok && r.Status() > 0 {
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done = true
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