如何区分 Ajax 请求和普通 Http 请求? [英] How to differentiate Ajax requests from normal Http requests?

问题描述

我在我的应用程序中使用 JSF 框架.我需要在 Phase Listener 类中的渲染响应阶段之前运行特定脚本.

I am using JSF framework in my application. I need to run a specific script before the render response phase in my Phase Listener class.

运行此脚本的条件是，如果触发的请求是 Ajax 请求，我需要运行该脚本，如果触发的请求是 Http 请求，我不应该运行该脚本.

Condition for running this script is that, if the request triggered is a Ajax request i need to run the script, if the request triggered is a Http request i should not run that script.

谁能帮我区分收到的请求.

Can anyone please help me to differentiate the requests recieved.?

推荐答案

Ajax 请求通常有一个 X-Requested-With: XMLHttpRequest 请求头.在 JSF 中，您可以通过 ExternalContext#getRequestHeaderMap().

Ajax requests have usually a X-Requested-With: XMLHttpRequest request header. In JSF, you can obtain the request headers by ExternalContext#getRequestHeaderMap().

ExternalContext externalContext = facesContext.getExternalContext();
Map<String, String> headers = externalContext.getRequestHeaderMap();
boolean ajax = "XMLHttpRequest".equals(headers.get("X-Requested-With"));

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