jquery is a class library for js. js itself cannot operate headers because js starts executing headers during the browser loading page.
If it is ajax, you can set the header
$.ajax({
url: "",
data: {},
type: "GET",
beforeSend: function(xhr){('X-Test-Header', 'test-value');},//Set the header here success: function() {}
});
That is, setRequestHeader function
How to set up a special RequestHeader in ajax request
Ajax applications are now quite widespread, and there are many good ajax frameworks available. ajax is an asynchronous request, and is mainly a client scripting behavior. So, how do you add some special header information to the request before the request?
The following is a simple example. I wrote it in jQuery. There is a beforeSend method in its ajax function. This method accepts a parameter, which represents the XMLHttpRequest object that initiates an asynchronous request. We can use the setRequestHeader method of this object to achieve our purpose.
Why setRequestHeader?
For example, in a timely communication system, every time you get a message or send a message, you need to determine whether the user is still connected. By setting "accessToken", normal communication can be achieved;
beforeSend: function(request) {
("accessToken", accessToken);
},
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="" Inherits="Default2" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http:///TR/xhtml1/DTD/">
<html xmlns="http:///1999/xhtml">
<head runat="server">
<title></title>
<script src="jquery-1.3." type="text/javascript"></script>
<script type="text/javascript" language="javascript">
$(function() {
$("#test").click(function() {
$.ajax({
type: "GET",
url: "",
beforeSend: function(request) {
("Test", "Chenxizhang");
},
success: function(result) {
alert(result);
}
});
});
});
</script>
</head>
<body>
<form runat="server">
<div >
</div>
<input type="button" value="test" />
</form>
</body>
</html>
() How to set Accept content in Headers
In fact, it is very simple. First of all, if it is a common type, please set the dataType property directly
$.ajax({
dataType: "json",
type: "get",
success: function (data) {
}
});
After setting dataType, you will go to the accepts property (this property will preset some common types) and directly add the corresponding type to Accept.
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If you want to customize the Accept content that is not in jQuery yourself, you can manually set the accepts property, use the key-value pair to store it, and then set the dataType property to the key you just customized.
$.ajax({
accepts: {
xxx: "application/xxx"
},
dataType: "xxx",
type: "get",
success: function (data) {
}
});
Of course, you can also set the headers attribute directly and write what the Accept content is.
$.ajax({
headers: {
Accept: "application/json; charset=utf-8"
},
type: "get",
success: function (data) {
}
});
The above is the method of setting request information in the header of jQuery introduced to you. I hope it will be helpful to you. If you have any questions, please leave me a message and the editor will reply to you in time. Thank you very much for your support for my website!