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The Cache-Control: no-cache HTTP/1.1 header field is also intended for use in requests made by the client. It is a means for the browser to tell the server and any intermediate caches that it wants a fresh version of the resource. The Pragma: no-cache header field, defined in the HTTP/1.0 spec, has the same purpose. It, however, is only defined ...
User-Agent header. In computing, the User-Agent header is an HTTP header intended to identify the user agent responsible for making a given HTTP request. Whereas the character sequence User-Agent comprises the name of the header itself, the header value that a given user agent uses to identify itself is colloquially known as its user agent ...
The range header is used by HTTP clients to enable resuming of interrupted downloads, or split a download into multiple simultaneous streams. 207 Multi-Status (WebDAV; RFC 4918) The message body that follows is by default an XML message and can contain a number of separate response codes, depending on how many sub-requests were made.
HTTP referer. In HTTP, " Referer " (a misspelling of " Referrer " [ 1 ]) is an optional HTTP header field that identifies the address of the web page (i.e., the URI or IRI ), from which the resource has been requested. By checking the referrer, the server providing the new web page can see where the request originated.
Byte serving (other names: Range Requests; Byte Range Serving; Page on demand) is the process introduced in HTTP protocol 1.1 of sending only a portion of a message from a server to a client. Byte serving begins when an HTTP server advertises its willingness to serve partial requests using the Accept-Ranges response header.
HTTP ( Hypertext Transfer Protocol) is an application layer protocol in the Internet protocol suite model for distributed, collaborative, hypermedia information systems. [ 1] HTTP is the foundation of data communication for the World Wide Web, where hypertext documents include hyperlinks to other resources that the user can easily access, for ...
HTTP/2 allows the server to "push" content, that is, to respond with data for more queries than the client requested. This allows the server to supply data it knows a web browser will need to render a web page, without waiting for the browser to examine the first response, and without the overhead of an additional request cycle.
HTTP message. The request/response message consists of the following: Request line, such as GET /logo.gif HTTP/1.1 or Status line, such as HTTP/1.1 200 OK, Headers. An empty line. Optional HTTP message body data. The request/status line and headers must all end with <CR><LF> (that is, a carriage return followed by a line feed ).