英文:
How can I override content type header of every responses for http.Client?
问题
我有一个在Go语言中的http.Client，我希望它在处理响应之前将每个响应的内容类型更新为application/json（即使实际情况可能不是这样）。
我应该覆盖哪个属性？
背景：在第三方API中存在一个错误，实际的内容类型是application/json，但它被设置为其他值（错误的值）。
代码片段：
...
requestURL := fmt.Sprintf("http://localhost:%d", serverPort)
req, err := http.NewRequest(http.MethodGet, requestURL, nil)
if err != nil {
fmt.Printf("client: could not create request: %s\n", err)
os.Exit(1)
}
res, err := http.DefaultClient.Do(req)
if err != nil {
fmt.Printf("client: error making http request: %s\n", err)
os.Exit(1)
}
fmt.Printf("client: got response!\n")
fmt.Printf("client: status code: %d\n", res.StatusCode)
resBody, err := ioutil.ReadAll(res.Body)
if err != nil {
fmt.Printf("client: could not read response body: %s\n", err)
os.Exit(1)
}
fmt.Printf("client: response body: %s\n", resBody)
}
英文:
I've got a http.Client in go and I want it to update every content type for every response to application/json (even though it might not be the case) even before it process the response.
Which attribute shall I override?
Context: the underlying issue there's a bug in the third party API where the real content type is application/json but it's set to the other thing (incorrectly).
Code snippet:
...
requestURL := fmt.Sprintf("http://localhost:%d", serverPort)
req, err := http.NewRequest(http.MethodGet, requestURL, nil)
if err != nil {
fmt.Printf("client: could not create request: %s\n", err)
os.Exit(1)
}
res, err := http.DefaultClient.Do(req)
if err != nil {
fmt.Printf("client: error making http request: %s\n", err)
os.Exit(1)
}
fmt.Printf("client: got response!\n")
fmt.Printf("client: status code: %d\n", res.StatusCode)
resBody, err := ioutil.ReadAll(res.Body)
if err != nil {
fmt.Printf("client: could not read response body: %s\n", err)
os.Exit(1)
}
fmt.Printf("client: response body: %s\n", resBody)
}
答案1
得分: 2
package main
import (
"fmt"
"net/http"
)
type MyRoundTripper struct {
httprt http.RoundTripper
}
func (rt MyRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
res, err := rt.httprt.RoundTrip(req)
if err != nil {
fmt.Printf("错误: %v", err)
} else {
res.Header.Set("Content-Type", "application/json")
}
return res, err
}
func main() {
client := &http.Client{Transport: MyRoundTripper{http.DefaultTransport}}
resp, err := client.Get("https://example.com")
if err != nil {
// 处理错误
}
fmt.Printf("%+v\n", resp.Header)
}
以上是一个Go语言的代码示例，它使用自定义的MyRoundTripper类型来修改HTTP请求的行为。在RoundTrip方法中，它首先调用原始的RoundTrip方法来发送请求，然后根据需要修改响应的头部信息。在main函数中，它创建了一个使用MyRoundTripper作为传输层的HTTP客户端，并发送一个GET请求到https://example.com。最后，它打印出响应的头部信息。
英文:
package main
import (
"fmt"
"net/http"
)
type MyRoundTripper struct {
httprt http.RoundTripper
}
func (rt MyRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
res, err := rt.httprt.RoundTrip(req)
if err != nil {
fmt.Printf("Error: %v", err)
} else {
res.Header.Set("Content-Type", "application/json")
}
return res, err
}
func main() {
client := &http.Client{Transport: MyRoundTripper{http.DefaultTransport}}
resp, err := client.Get("https://example.com")
if err != nil {
// handle error
}
fmt.Printf("%+v\n", resp.Header)
}
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