etag

To submit data to Baidu, we basically will think of Sitemap, recently launched the etag is what dongdong? Is it really effective? Sitemap is one of the most important ways to solve the site, and the usual Sitemap updates are not very timely, and volume are relatively large, at this time also consumes the corresponding Web site traffic and bandwidth. And ETag can be used to indicate whether the Web page has

Etag Edit entry Sharing This entry was created by LCLNL, and has been edited 2 times by a total of 1 collaborators. The newest association author: lclnl. Please describe the term in a simple sentence and add a summary immediately. directory 1 how last-modified and etags help improve performance? 2 Function 3 Working principle 4 Apache ETag to achieve 5 weak checksum (weak

1, ETag and expires the client-side HTTP Request header and server-side HTTP reponse Header working principle. 2, static under the Apache, Lighttpd and Nginx ETag and expires configuration 3. ETag and expires processing in non-real-time interactive dynamic pages When the client makes the first request for a URL through the browser, according to the HTTP protoc

The HTTP specification defines ETag as the object Value of the requested variable ". In other words, ETag is a token that can be associated with Web resources ). A typical Web resource can be a Web page, but it may also be a JSON or XML document. The server is solely responsible for determining what the mark is and its meaning, and transmitting it to the client in the HTTP Response Header. The following is

1. How the Client-side Http Request Header and Server-side Http Reponse Header work in Etag and Expires. 2. Static configuration of Etag and Expires in Apache, Lighttpd, and Nginx 3. Etag and Expires processing on dynamic pages with non-real-time interaction When the client sends a Request for a URL for the first time through a browser, the browser will send th

latest resources when the server changes. 　　 2) What is an "Etag"?The HTTP protocol specification defines the etag as the entity value of the requested variable (see-section 14.19). Another argument is that the ETag is a token that can be associated with a Web resource. A typical web resource can be a Web page, but it may also be a JSON or XML document. The serv

Etag Text/finalbsdWe all know that there is an etag in HTTP/1.1 to determine whether the requested file has been modified.Why use etag? Etag is mainly used to solve some problems that last-modified cannot solve.1. Some files may be changed cyclically, but their content does not change (only the modification time).

Original finishing is not easy, reproduced please indicate the source: using SSH to develop rest Web Services support HTTP ETag Header tutorial detailedCode: http://www.zuidaima.com/share/1777391667989504.htmIntroductionThe great impact of the rest-mode application architecture in recent days has highlighted the importance of elegant design for Web applications. Now people are beginning to understand the intrinsic scalability and resilience of the "WW

The rest API, which is made with the Django Rest framework, has an API that requires:The app side requests this API, the server side reads the data from the database, returns the JSON. The amount of data returned is slightly larger, but may only be modified once a year, so you want to be able to transfer data only when the data is modified, so that the app side updates.1. Last-modified and ETagThe HTTP response header last-modified and ETag both imple

Re: http://www.oschina.net/question/234345_42536? Sort = Time If the server is a cluster, the etag parameters in the HTTP header returned by different servers are different. If the image is generated by a program, we can use the no-Cache headers to control it. But what if these images are Apache or nginx?The following describes etag: Etag is introduced in http1.

In the study of tornado, there is an etag more curious, from the online query excerpt as follows:ETag is introduced in HTTP1.1, the main function is to add a (CSS file, image, JavaScript file) a unique parameter (equivalent to the query parameter string), the ETag has server-side generation, and as the file changes, In this way, the browser will only re-request to obtain the

restarts the server, the resource is issued again, similar to the first request. This ensures that resources are not duplicated to the client and that the client is able to get the latest resources when the server changes. Note: If the if-modified-since time is later than the current time of the server (current request time request_time), it will be considered an illegal request. 2 , Etag Working principle The HTTP protocol specification defines

are not duplicated to the client, and that the client is able to get the latest resources when the server changes. Note: If the if-modified-since time is later than the current time of the server (the current request time Request_time), it will be considered an illegal request .2 , how the Etag works The HTTP protocol specification defines the ETag as the entity tag of the requested variable (see 14.19).

Etag-last-modifiedAnd how does etags help improve performance? Use the HTTP header of the last-modified and etags requests together, so that the cache of the client (such as a browser) can be used. Because the server first generates the last-modified/etag mark, the server can use it later to determine whether the page has been modified. Essentially, the client sends this mark back to the server and requires

client and that the client is able to get the latest resources when the server changes.Note: If the if-modified-since time is later than the current time of the server (current request time request_time), it will be considered an illegal request.2, ETag working principleThe HTTP protocol specification defines etag as the entity tag of the requested variable (see 14.19). A simple point is that the request U

http://www.cnblogs.com/hust-ghtao/: Hua ke xiao Tao: The previous time to participate in a company's interview, asked me etag field, when said is not very clear, found some information, collation for this article. simple ETag is similar to the fingerprint of a resource entity, and they can be quickly compared to determine whether the two versions of the resource are the same . The

Https://developers.google.com/web/fundamentals/performance/optimizing-content-efficiency/http-caching?hl=zh-cnThe only thing we have to do is make sure the server provides the necessary ETag tokens. Check your server documentation for any configuration flags that are not necessary.There is no etag is the server configuration, Each resource can define its cache policy through the Cache-control HTTP

Principle: Do not use Javascript,session,cookies,flash. Using picture ETag to identify users 1. Generate a unique etag based on the user's remote_addr and http_user_agent. 2. Output the ETag to the client. 3. Get Http_if_none_match to determine whether to access the same user. . htaccess rewrite SOURCE index.php: ? Define (' SECRET ', ' j8s91slksd9ab

Caching mechanismCheck the Expires expiration time (in http1.0), (in http1.1) check Cache-control for Max-age, higher priority Pragma (compatible with http1.0, which has the same meaning as Cache-control in http/1.1 protocol) Whether the cache resource can be used directly. You can use: Returns a (from cache) when no interaction between the browser and the server has expired: (1) Using last-modified If-modified-since: Last Modified time The server determines whether the resource is modified or n

Basic knowledge1 What is "last-modified"?When the browser first requests a URL, the server-side return status is 200, the content is the resource you requested, and there is a last-modified attribute that marks the last time the file was modified at the service end, similar in format:Tue, APR 13:53:56 GMT The second time the client requests this URL, according to the HTTP protocol, the browser sends the If-modified-since header to the server asking if the file has been modified after that time: