Created
February 2, 2017 21:40
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Golang HTTP Handler request/response logger
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func logger(prefix string, h http.Handler) http.HandlerFunc { | |
return func(w http.ResponseWriter, r *http.Request) { | |
// Save a copy of this request for debugging. | |
requestDump, err := httputil.DumpRequest(r, false) | |
if err != nil { | |
log.Println(err) | |
} | |
log.Println(prefix, string(requestDump)) | |
rec := httptest.NewRecorder() | |
h.ServeHTTP(rec, r) | |
dump, err := httputil.DumpResponse(rec.Result(), false) | |
if err != nil { | |
log.Fatal(err) | |
} | |
log.Println(prefix, string(dump)) | |
// we copy the captured response headers to our new response | |
for k, v := range rec.Header() { | |
w.Header()[k] = v | |
} | |
// grab the captured response body | |
data := rec.Body.Bytes() | |
w.Write(data) | |
} | |
} |
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w.WriteHeader(rec.Code)
needs to be called beforew.Write(data)
.