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Most people do not understand the knowledge points of this article "java how to intercept ajax requests", so the editor summarizes the following content, detailed content, clear steps, and has a certain reference value. I hope you can gain something after reading this article. Let's take a look at this "how to intercept ajax requests by java" article.

Principle.

No matter which framework or library your application makes Ajax requests, it will eventually return to XMLHttpRequest. Therefore, the essence of interception is to replace the browser's native XMLHttpRequest. Specifically, save the XMLHttpRequest before replacement, and then decide whether to initiate a network request according to the specific business logic during the request process, and then create a real XMLHttpRequest instance if necessary.

Fly intercepts global ajax

We know that in Fly, XMLHttpRequest is a http engine. So if we want to intercept, we only need to customize an engine to replace the global XMLHttpRequest, and Fly provides a tool to quickly generate engine, so we can easily intercept.

Let's start with a simple example that outputs url and method for each network request.

Realize

Let's test a request with axios:

You can see that the requested url and method are output in the console, and our interception is successful. The result object of the second line is printed by axios then.

Because Fly supports switching engine, we can directly switch the fly engine to the real XMLHttpRequest and then overwrite it, so that all network requests in the fly are initiated through the real XMLHttpRequest (in fact, the default engine of fly in the browser environment is XMLHttpRequest, which does not need to be switched manually, so it is switched manually here for clarity). Fly automatically synchronizes the request headers based on the request object. If you want to block the request, you can simply return it in adapter.

Other interception methods

Ajax-hook, the open source library on Github, can also intercept global ajax requests. The difference is that it can intercept every step and callback of an ajax request, which is not only powerful, but also 1KB. Compared with the above method of intercepting through fly engine, Ajax-hook has a finer interception granularity, but Ajax-hook does not support browsers below IE9 because it uses ES5's getter and setter.

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