NSURLCache和ETags [英] NSURLCache and ETags

问题描述

NSURLCache是​​否透明地处理服务器收到的ETag？我的意思是：它是否为每个URL请求自动存储ETag，然后在提交对同一URL的请求时发送相应的IF-None-Match？
或者我必须自己管理吗？

Does NSURLCache transparently handles ETags received by server? I mean: does it automatically store ETags for each URL request and then send the appropriate IF-None-Match when a request to the same URL is submitted? Or do I have to manage it by myself?

推荐答案

是的，如果你设置它的缓存，它会透明地处理它模式：

yes it does handle it transparently if you set its cache mode:

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:urlString]
                                                           cachePolicy: NSURLRequestUseProtocolCachePolicy
                                                       timeoutInterval:60];

注意：您根本无法看到请求中的标头，并且如果返回304响应服务器只能看到从缓存中透明加载的200响应。

note: you cannot see the header in the request at all and if a 304 response is returned by the server you will only see the 200 response that it transparently loaded from the cache.

这篇关于NSURLCache和ETags的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！