304 not modified

Explain:The "from cache" is the browser does not confirm with the server, directly using the browser cache;304 Not Modified is a cache that the browser and server have confirmed more than once for cache validity.Trigger difference:The "from cache"

Conditional GETs is a great a-to-reduce bandwidth, and potentially server-side performance, depending on how the inform Ation used to determine conditions is calculated. A well-designed web site may return 304 (not Modified) responses for the many

Code and principle of 304 Not Modified on the asp.net page, 304 modified Through the previous example, we have seen the benefits of Caching: it can be reduced to server access, because the page can be displayed without accessing the server, which

From the previous example, we have seen the benefits of caching: it is possible to reduce access to the server, because the server can display the page, which for the server, can alleviate some of the access pressure. However, if the user forces the

We all know that the browser will cache the webpage that has accessed the website. The browser accesses a webpage through the URL address, and the webpage content will be cached on the computer while displaying the webpage content. If the webpage is

We all know that the browser will cache the webpage that has accessed the website. The browser accesses a webpage through the URL address, and the webpage content will be cached on the computer while displaying the webpage content. If the webpage is

Introduction to using ETags to reduce Web application bandwidth and load Recently, the public has been strongly interested in the REST-style application architecture, indicating that the elegant design of the Web has begun to attract attention. Now,

Reprinted from: HTTPS://WWW.JIANSHU.COM/P/32733A356ACF Network-specific latency and the cost of data transmission, restricting the Internet to quickly obtain web resources. To this end, the HTTP protocol introduces caching to space-time, allowing

When the HTTP request contains the header of the if-xxx style, the server will judge the attached condition, and the request will be executed only if the specified condition is true. Such requests have five headers, namely If-modified-since,

A good HTTP caching strategy can significantly improve the performance of Web applications and the experience of their clients. The main use of the "Cache-control" HTTP response header to complete, with conditional headers such as "last-modified"

The httpservlet class defines a getlastmodified method. Its complete syntax is defined as follows: Protected long getlastmodified (httpservletrequest req) The returned value indicates the number of milliseconds that have been calculated since 00:00:0

Http status code (200, 404, 500, etc.) (to CSDN), 500 and other csdn When we send a request from a client to the serverThe server returns the status code to us.The status code is the status of the server response.Through this, we can know whether

Sometimes, to hide the truth, we define the file as a header and then download the readfile, but this will increase the burden on the server. Generally, we do not recommend downloading large files. Sometimes, to hide the truth, we define the file as

OutputCache is intended for all users accessing server resources. The browser cache described in this article is intended for individual users, so that the browser does not continuously access the dynamic content on the server under our control,

HTTP error code meaning:"Continue":"101": Witching Protocols"$": OK"201": Created"202": Accepted"203": non-authoritative information"204": No Content"205": Reset Content"206": Partial Content"Multiple": Choices"301": Moved Permanently"302": Found"303

Copy CodeThe code is as follows: function SendFile ($fileName, $fancyName = ", $forceDownload = true, $speedLimit = 0, $contentType =") { if (!is_readable ($fileName)) { Header ("http/1.1 404 Not Found"); return false; } $fileStat = stat

The Performance of a website must be considered in two aspects: the operational efficiency on the Server side and the efficiency on the Client side. Do not think that the Server is highly efficient. This website or service is highly efficient for

Sometimes, to hide the truth, we define the file as a header and then download the readfile, but this will increase the burden on the server. generally, we do not recommend downloading large files. The code is as follows: Function sendFile ($

Php sends a file & lt ;? PhpfunctionsendFile ($ fileName, $ fancyName, $ forceDownloadtrue, $ speedLimit0, $ contentType) {& nbsp; if (! Is_readable ($ fileName) & nbsp; & php send file Function sendFile ($ fileName, $ fancyName = '', $

Https://www.cnblogs.com/cgzl/p/9165388.htmlSome of the preparatory knowledge required for this article can be seen here: http://www.cnblogs.com/cgzl/p/9010978.html and http://www.cnblogs.com/cgzl/p/9019314.htmlTo establish a Richardson maturity