How can I access the response body in Go's reverse proxy?
How to Access Response Body in Go's Reverse Proxy
In Go, the httputil/reverseproxy package provides a convenient way to implement a reverse proxy server. However, accessing the response body of the underlying HTTP request can be challenging.
Original Code
The given Go code demonstrates a simple reverse proxy server:
package main
import (
"net/http"
"net/http/httputil"
"net/url"
)
func main() {
target := &url.URL{Scheme: "http", Host: "www.google.com"}
proxy := httputil.NewSingleHostReverseProxy(target)
http.Handle("/google", proxy)
http.ListenAndServe(":8099", nil)
}Accessing Response Body
To access the response body, you can utilize the ModifyResponse function provided by the httputil/reverseproxy package. This function allows you to modify the HTTP response before it is sent to the client.
By implementing the ModifyResponse function, you can perform various operations on the response, including:
- Read and modify the response body
- Set custom headers
- Redirect the response
Example
Here's an example of how you can modify the response body:
func rewriteBody(resp *http.Response) (err error) {
b, err := ioutil.ReadAll(resp.Body) // Read html
if err != nil {
return err
}
err = resp.Body.Close()
if err != nil {
return err
}
b = bytes.Replace(b, []byte("server"), []byte("schmerver"), -1) // replace html
body := ioutil.NopCloser(bytes.NewReader(b))
resp.Body = body
resp.ContentLength = int64(len(b))
resp.Header.Set("Content-Length", strconv.Itoa(len(b)))
return nil
}
target, _ := url.Parse("http://example.com")
proxy := httputil.NewSingleHostReverseProxy(target)
proxy.ModifyResponse = rewriteBodyBy implementing the ModifyResponse function in this way, you can modify and read the response body before it is sent to the client.
The above is the detailed content of How can I access the response body in Go's reverse proxy?. For more information, please follow other related articles on the PHP Chinese website!
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