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How Can I Log HTTP Responses in a Go Web Application Using Gorilla Mux and Handlers?
How Can I Log HTTP Responses in a Go Web Application Using Gorilla Mux and Handlers?
Logging HTTP Responses with Go and Gorilla's Mux and Handler Packages
In a Go application, utilizing Gorilla's mux and handler packages for constructing a web application presents a challenge when trying to log HTTP responses. While logging requests is easily achieved with Gorilla's LoggingHandler, logging responses requires a different approach.
One potential solution is to create a custom middleware function that wraps the original handler. This middleware can intercept both the request and the response, allowing for logging of both as shown in the following code:
func logResponse(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// Capture the request
requestBytes, err := httputil.DumpRequest(r, true)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
log.Printf("%q", requestBytes)
// Create a new ResponseRecorder to capture the response
rec := httptest.NewRecorder()
next.ServeHTTP(rec, r)
// Capture the response
responseBytes := rec.Body.Bytes()
log.Printf("%q", responseBytes)
// Copy the recorder's headers and body into the original ResponseWriter
for k, v := range rec.HeaderMap {
w.Header()[k] = v
}
w.WriteHeader(rec.Code)
w.Write(responseBytes)
})
}
This middleware can then be utilized by wrapping the original handler in Gorilla's router:
// Import Gorilla packages
import (
"github.com/gorilla/mux"
"github.com/gorilla/handlers"
)
func main() {
// Setup Gorilla router
r := mux.NewRouter()
// Wrap the handler with the logging middleware
wrappedHandler := handlers.LoggingHandler(os.Stdout, http.HandlerFunc(handler))
// Register the handler with the router
r.Handle("/api/v1/users", wrappedHandler)
// Start the server
http.ListenAndServe(":8080", r)
}
By using this custom middleware, both the HTTP requests and responses can be easily logged, enhancing the observability of the application and aiding in debugging and performance monitoring.
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