etag

问题 I need to be able to insert an entity to an azure storage table under these conditions: if it doesn't exist, insert. if it exists, but I specify ETag to be *, then replace. if it exists, but ETag has another value, then throw StorageException with code 409 or 412. (for example I would try to insert an entity I have retrieved, but it has been updated from elsewhere in the meantime) I made this simple program to test, but I can't figure out how to get this to work. it never reaches the

问题 REST allows to use etags for caching. Similarly browser supports caching unless headers like the following are set -> maxage, expires, cache-control: private What is difference between etags and the above mentioned caching approach? 回答1: What is difference between etags and normal browser provided caching? I think you will find that they are very different ideas. In HTTP, caching semantics are defined by RFC 7234: Caching. Entity tags are defined by RFC 7232: Conditional Requests An entity

问题 I send a "playlistItems" request with this headers: array(5) { [0]=> string(29) "Content-Type:application/json" [1]=> string(153) "Authorization:Bearer [hidden]" [2]=> string(33) "X-JavaScript-User-Agent:Automator" [3]=> string(66) "If-Match:"Bdx4f4ps3xCOOo1WZ91nTLkRZ_c/AtpZMDGfwUXtVHbcH_1spJYn8eg"" [4]=> string(71) "If-None-Match:"Bdx4f4ps3xCOOo1WZ91nTLkRZ_c/AtpZMDGfwUXtVHbcH_1spJYn8eg"" } The url is: https://www.googleapis.com/youtube/v3/playlistItems?part=id%2Csnippet&playlistId=UUvmF_tzu

问题 I'm trying to adjust my application configuration in order to setup ETag support. I have just checked this SO question, so let me say where my code is different from it: I don't use any xml configuration file whatsoever. I'm using different configuration classes for each aspect of the system. My WebConfig looks like this: @Configuration @EnableAutoConfiguration @ComponentScan(basePackages = { "xxx", "yyy" }) public class WebConfig extends WebMvcConfigurerAdapter { @Bean public Filter

问题 I'm trying to adjust my application configuration in order to setup ETag support. I have just checked this SO question, so let me say where my code is different from it: I don't use any xml configuration file whatsoever. I'm using different configuration classes for each aspect of the system. My WebConfig looks like this: @Configuration @EnableAutoConfiguration @ComponentScan(basePackages = { "xxx", "yyy" }) public class WebConfig extends WebMvcConfigurerAdapter { @Bean public Filter

问题 I am running PHP on Apache, and am confused about how to implement server-side caching, in order to make the site load faster. What is the difference between the Expires , Last-Modified and ETag headers, and which one should be used in what situation? 回答1: You can use the Expires header in conjunction but regardless of the other two. It's universally supported by proxies and browser caches. The difference between ETag and Last-Modified stamps is more semantic. ETags are opaque to clients. It

问题 I am trying to learn some basics about HTTP. I've inspected a some HTTP response headers and noticed 2 things that confused me: There was no cache-control header and ETag header was present. The way I understood ETag is that, client sends ETag in a requests to a cache, and cache revalidates resources Etag with the server. But if there is no Cache-Control header in response, than all subsequent requests do the revalidation directly with the server and completely omit cache. Is this the case or

问题 I want to know how can okHTTP response from Web server (which returns json data) be cached? I want my app to download all the data needed for RecycleView and cache it once the user runs the app first time - and avoid re-downloading and parsing all the same data from Web server, if data has not changed. I tried to get response headers, but this is what I get: Request URL: https://somedomain.com/wp-json/?categories=3&per_page=100&status=publish Request Method: GET Status Code: 200 OK Remote

问题 I want to know how can okHTTP response from Web server (which returns json data) be cached? I want my app to download all the data needed for RecycleView and cache it once the user runs the app first time - and avoid re-downloading and parsing all the same data from Web server, if data has not changed. I tried to get response headers, but this is what I get: Request URL: https://somedomain.com/wp-json/?categories=3&per_page=100&status=publish Request Method: GET Status Code: 200 OK Remote

来源： https://stackoverflow.com/questions/57778288/fetch-with-if-none-match-etag-header-always-returning-200-in-react-native-a