Custom request header configuration and use cases of http.Transport in Go language

Custom request header configuration and use cases of http.Transport in Go language

Go language is a programming language that has been gaining momentum in recent years. It is equipped with simple and efficient features and excellent concurrency capabilities. Popular with developers. In developing web applications, network requests are an inevitable link. The Go language provides the http package in the standard library, and the http.Transport type provides the configuration function of customizable request headers, which facilitates us to handle various needs in actual development.

The http.Transport structure provides some configuration options, such as connection idle timeout, retry strategy, etc., but we focus here on how to customize request headers.

First, we need to import the http package:

import "net/http"

Next, we create a variable of type http.Transport to get its configuration:

transport := &http.Transport{}

Now, we can Use the Set method provided by http.Transport to set custom request headers. The Set method receives two parameters. The first parameter is a pointer of http.Request type, and the second parameter is a value of string slice type. We can pass the existing http.Request variable using a pointer and add custom request headers in the slice.

The following is a simple example. We add a custom request header X-User-Token during the GET request:

req, _ := http.NewRequest("GET", "http://example.com", nil)
req.Header.Set("X-User-Token", "my-token")

transport := &http.Transport{}
transport.Set(req, []string{})

In the above example, We first created a GET request and set the target address to http://example.com, and then used the Set method to set a custom request header X- User-Token, the value is my-token.

Finally, we also need to use http.Client type variables to perform requests:

client := &http.Client{
    Transport: transport,
}

resp, _ := client.Do(req)
defer resp.Body.Close()

In the above code, we use the http.Client structure and pass it Enter the custom http.Transport type variable transport, and then send the request by executing client.Do(req), and after getting the response Call resp.Body.Close()Close the response Body.

In actual applications, more complex custom request header configurations can be performed according to needs. For example, we can add different request headers according to different request types, or add encrypted signatures, user authentication and other information to the request headers.

Summary:

This article introduces the custom request header configuration and use cases of http.Transport in Go language, showing how to use http.Transport andhttp.ClientThe structure implements customization of HTTP request headers. By flexibly using this feature, we can meet our various needs and make our web applications more flexible and secure.

It should be noted that in actual development, we should also consider the security and legality of the request header to ensure that our application can still work normally in the face of unreliable external environments.

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