drmg17928 2017-11-24 03:27
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对每个请求使用相同的标头

I want to be able to use the same headers for every request made by an HTTP client without having to specify them for every request like so:

req, err := http.NewRequest("GET", fmt.Sprintf("https://%s", endpoint), nil)
if err != nil {
    log.Printf("Error making request to endpoint: %+v", err)
    return p, err
}
req.Header.Add("Authorization", "Bearer")
req.Header.Add("Version", "2017-11-23") 
resp, err := client.Do(req)

Is there a way to configure this on the client?

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1条回答 默认 最新

  • douzhuo6931 2017-11-24 03:42
    关注

    Use a function to encapsulate the code to create and configure the request:

    func newRequest(endpoint string) (*http.Request, error) {
        req, err := http.NewRequest("GET", fmt.Sprintf("https://%s", endpoint), nil)
        if err != nil {
            return nil, err
        }
        req.Header.Add("Authorization", "Bearer")
        req.Header.Add("Version", "2017-11-23") 
        return req, nil
    }
    

    A more complicated approach is to implement a round tripper that adds the headers and delegates to another round tripper:

    type transport struct {
        underlyingTransport http.RoundTripper
    }
    
    func (t *transport) RoundTrip(req *http.Request) (*http.Response, error) {
        req.Header.Add("Authorization", "Bearer")
        req.Header.Add("Version", "2017-11-23") 
        return t.underlyingTransport.RoundTrip(req)
    }
    

    Use it to create a client like this:

    c := http.Client{Transport: &transport{ underlyingTransport: http.DefaultTransport } }
    

    The transport adds the headers on calls to c.Do(), c.Get(), c.Post(), etc.

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论

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