golang determines ajax request

In Web development, AJAX (Asynchronous JavaScript and XML) has become one of the indispensable technologies. AJAX requests can request data from the server asynchronously, and JavaScript can be used to update the data without refreshing the page, which greatly improves the user experience. When using Golang for web development, how to determine whether it is an AJAX request? This article will introduce a simple method.

First of all, you need to understand a Header attribute in the HTTP request-X-Requested-With. This attribute can be used to determine whether the current request is an AJAX request. When the browser sends an AJAX request through the XMLHttpRequest object, the X-Requested-With attribute is set to XMLHttpRequest. In a normal GET or POST request, this attribute will not be set.

Therefore, we can determine whether the current request is an AJAX request by determining whether the HTTP header contains the X-Requested-With attribute. In Golang, you can use the Header attribute of the Request object provided by the net/http library to read HTTP header information. The following is a sample code for judging AJAX requests:

func ajaxHandler(w http.ResponseWriter, r *http.Request) {
    isAjax := r.Header.Get("X-Requested-With") == "XMLHttpRequest"
    if isAjax {
        fmt.Println("This is an AJAX request")
    } else {
        fmt.Println("This is a normal HTTP request")
    }
}

Among them, r.Header.Get("X-Requested-With") is used to obtain the X-Requested-With attribute of the current request, and then judge its Whether the value is XMLHttpRequest. If so, the current request is an AJAX request and the corresponding processing logic is executed; otherwise, the current request is an ordinary HTTP request and another processing logic is executed.

It should be noted that since the attribute names in the HTTP header are case-insensitive, the X-Requested-With attribute should be obtained in all uppercase letters, that is, r.Header.Get("X-Requested- With").

In addition to the above methods, there is a simpler way to judge AJAX requests. When using web frameworks such as Gorilla Web Toolkit, you can directly use r.Header.Get("Content-Type") to determine whether the Content-Type attribute is application/x-www-form-urlencoded. Because in a traditional HTTP request, the Content-Type of the form data is application/x-www-form-urlencoded.

For AJAX requests that send data in JSON format, you need to determine whether the Content-Type attribute is application/json. The specific code is as follows:

func ajaxHandler(w http.ResponseWriter, r *http.Request) {
    contentType := r.Header.Get("Content-Type")
    isAjax := contentType == "application/x-www-form-urlencoded" || contentType == "application/json"
    if isAjax {
        fmt.Println("This is an AJAX request")
    } else {
        fmt.Println("This is a normal HTTP request")
    }
}

The above are the two methods for judging AJAX requests. It should be noted that these two methods are not absolutely reliable. In actual development, you may encounter some customized AJAX requests (such as modifying the X-Requested-With attribute in the request header), which may lead to errors in judgment. Therefore, appropriate adjustments need to be made according to the specific situation.

Generally speaking, the method of judging AJAX requests is relatively simple. You only need to judge based on the attributes in the HTTP header. In actual development, appropriate adjustments need to be made according to specific needs to meet specific business needs.

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