How to change ajax response header without writing php

How to change the AJAX response header without writing PHP

AJAX (Asynchronous JavaScript and XML) is a commonly used Web development technology, which can request data asynchronously without refreshing the entire web page, thus Improve user experience. During the development process, in addition to the requested URL and POST parameters, the AJAX response header is also a very important part.

In some complex applications, developers need to control the content of the AJAX response header to make it consistent with the application's logic. In PHP, the header() function is usually used to set the AJAX response header. However, in some cases, we may need to modify the AJAX response headers without using PHP. This article will introduce some very practical ways to achieve this purpose.

1. Using jQuery

jQuery is a very popular JavaScript library that simplifies interaction with the DOM and AJAX. In jQuery, we can use the following code to modify the AJAX response header:

$.ajaxSetup({
    beforeSend: function(jqXHR) {
        jqXHR.overrideMimeType("text/plain; charset=x-user-defined");
    }
});

Through the beforeSend function, we can modify the properties of the jqXHR object to achieve the purpose of modifying the AJAX response header.

2. Using XMLHttpRequest

XMLHttpRequest is a native API in JavaScript, which can request data from the server without refreshing the entire page. Through XMLHttpRequest, we can request data from the server and modify the response headers after receiving the response. The following is an example of using XMLHttpRequest:

var xhr = new XMLHttpRequest();
xhr.open('GET', '/mydata', true);
xhr.onreadystatechange = function() {
    if (xhr.readyState == XMLHttpRequest.DONE && xhr.status == 200) {
        xhr.getResponseHeader('Content-Type'); // 获取响应头
        xhr.overrideMimeType('text/plain; charset=x-user-defined'); // 修改响应头
        console.log(xhr.responseText);
    }
};
xhr.send();

Through the overrideMimeType() function, we can modify the response header of the XMLHttpRequest object.

3. Using Fetch API

Fetch API is a JavaScript API for making network requests. It provides a simple and elegant way so that we can send HTTP requests and get responses. data. Through the Fetch API, we can request data from the server and modify the response headers after receiving the response. The following is an example of using the Fetch API:

fetch('/mydata')
  .then(function(response) {
    response.headers.get('Content-Type'); // 获取响应头
    response = new Response(response.body, {
      headers: {
        'Content-Type': 'text/plain; charset=x-user-defined' // 修改响应头
      }
    });
    console.log(response);
  });

By setting the headers property of the Response object, we can modify the response headers.

4. Summary

This article introduces three ways to modify the AJAX response header without using PHP. Using jQuery, XMLHttpRequest and the Fetch API are all very simple and elegant ways to give us better control over the content of the AJAX response headers in order to implement our application logic.

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