I would like to ask if we can create 'middleware' functions for Go http client? Example I want to add a log function, so every sent request will be logged, or add setAuthToken so the token will be added to each request's header.
2条回答 默认 最新
- doufan6886 2016-09-16 10:01关注
You can use the
Transport
parameter in HTTP client to that effect, with a composition pattern, using the fact that:-
http.Client.Transport
defines the function that will handle all HTTP requests; -
http.Client.Transport
has interface typehttp.RoundTripper
, and can thus be replaced with your own implementation;
For example:
package main import ( "fmt" "net/http" ) // This type implements the http.RoundTripper interface type LoggingRoundTripper struct { Proxied http.RoundTripper } func (lrt LoggingRoundTripper) RoundTrip(req *http.Request) (res *http.Response, e error) { // Do "before sending requests" actions here. fmt.Printf("Sending request to %v ", req.URL) // Send the request, get the response (or the error) res, e = lrt.Proxied.RoundTrip(req) // Handle the result. if (e != nil) { fmt.Printf("Error: %v", e) } else { fmt.Printf("Received %v response ", res.Status) } return } func main() { var c = &http.Client{Transport:LoggingRoundTripper{http.DefaultTransport}} c.Get("https://www.google.com") }
Feel free to alter names as you wish, I did not think on them for very long.
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