in IE, the “X-Requested-With” header of jquery becomes “x-requested-with” (lowercase)

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醉话见心
醉话见心 2021-02-13 12:38

Why it is converting to lowercase? In Firefox it goes as: \"X-Requested-With\". While in IE, it goes as: \"x-requested-with\"

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  •  礼貌的吻别
    2021-02-13 13:19

    I had noticed something similar. Take a look at the sample code and what it does when I add some custom HTTP headers. First is the JavaScript code and then is the Fiddler dump (custom headers only) from IE8, Safari4 and Firefox3. Notice that Firefox honors case, IE converts to lowercase and Safari converts to propercase.

    However, as already mentioned, these are treated as case insensitive by the server so it really doesn't matter.

    function doXHR() {
      var request = new XMLHttpRequest();
      request.open('GET', '/header/header.txt');
      request.setRequestHeader('x-lowercase', 'X-lowercase');
      request.setRequestHeader('x-Propercase', 'X-Propercase');
      request.setRequestHeader('x-CamelCase', 'X-CamelCase');
      request.setRequestHeader('x-UPPERCASE', 'X-UPPERCASE');
      request.onreadystatechange = function() {
        if (request.readyState == 4) {
          console.log('Received XMLHttpRequest callback: \n' + request.responseText);
        }
      };
      request.send("");
    }
    

    User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; SLCC1; .NET CLR 2.0.50727; .NET CLR 3.5.21022; .NET CLR 3.5.30729; .NET CLR 3.0.30618)

    x-lowercase: X-lowercase
    x-camelcase: X-CamelCase
    x-uppercase: X-UPPERCASE
    x-propercase: X-Propercase
    

    User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US) AppleWebKit/528.18 (KHTML, like Gecko) Version/4.0 Safari/528.17

    X-Lowercase: X-lowercase
    X-Uppercase: X-UPPERCASE
    X-Camelcase: X-CamelCase
    X-Propercase: X-Propercase
    

    User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.0.6) Gecko/2009011913 Firefox/3.0.6 (.NET CLR 3.5.30729)

    x-lowercase: X-lowercase
    x-Propercase: X-Propercase
    x-CamelCase: X-CamelCase
    x-UPPERCASE: X-UPPERCASE
    

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