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by using the If_Modified_Since or If-None-Match request header, just … 3×× Redirection 304 Not Modified.

You can only respond with 304 Not Modified to a conditional query. HTTP 304: Not Modified :Not Modified客户端有缓冲的文档并发出了一个条件性的请求(一般是提供if-Modified-Since头表示客户只想比指定日期更新的文档)。服务器告诉客户,原来缓冲的文档还可以继续使 … A conditional GET or HEAD request has been received and would have resulted in a 200 OK response if it were not for the fact that the condition evaluated to false.. If you modify the application to allow caching of the resource (remove the Pragma header, change Cache-Control to public) and expose cache validator information (add Last-Modified and/or ETag headers) you can see that a conditional GET will be issued in some situations. It is an implicit redirection to a cached resource. For 304 Not Modified responses that are a result of a user agent generated conditional request the user agent must act as if the server gave a 200 OKresponse with the appropriate content.The user agent must allow setRequestHeader() to override automatic cache validation by setting request headers (e.g., If-None-Match, If-Modified-Since), in which case 304 Not Modified responses must be …

However, to get a 304 you need to tell the server in your request that he is allowed to use a 304, e.g. 304 Not Modified详解 第一次访问 200 鼠标点击二次访问 (Cache) 按F5刷新 304 按Ctrl+F5强制刷新 200 在客户端向服务端发送http请求时,若返回状态码为304 Not Modified 则表明此次请求为条件请求。 The HTTP 304 Not Modified client redirection response code indicates that there is no need to retransmit the requested resources. This happens when the request method is safe, like a GET or a HEAD request, or when the request is conditional and uses a If-None-Match or a If-Modified-Since header.

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