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In HTTP version 1.x, header fields are transmitted after the request line (in case of a request HTTP message) or the response line (in case of a response HTTP message), which is the first line of a message.
Standard response for successful HTTP requests. The actual response will depend on the request method used. In a GET request, the response will contain an entity corresponding to the requested resource. In a POST request, the response will contain an entity describing or containing the result of the action. 201 Created
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).
An HTTP/1.1 request made using telnet. The request message, response header section, and response body are highlighted. HTTP defines methods (sometimes referred to as verbs, but nowhere in the specification does it mention verb) to indicate the desired action to be performed on the identified resource. What this resource represents, whether pre ...
Cache the response and ETag, assuming there is an ETag and that the response was not aborted. For a subsequent request that would've included the If-None-Match header, do not send this header with perhaps a random 20% probability.
The HTTP Location header field is returned in responses from an HTTP server under two circumstances: To ask a web browser to load a different web page (URL redirection). In this circumstance, the Location header should be sent with an HTTP status code of 3xx. It is passed as part of the response by a web server when the requested URI has:
The response is cacheable unless indicated otherwise. Unless the request method was HEAD, the entity should contain a small hypertext note with a hyperlink to the new URL(s). If the 301 status code is received in response to a request of any type other than GET or HEAD, the client must ask the user before redirecting.
The HTTP Upgrade mechanism is used to establish HTTP/2 starting from plain HTTP. [4] The client starts an HTTP/1.1 connection and sends an Upgrade: h2c header. If the server supports HTTP/2, it replies with HTTP 101 Switching Protocol status code. The HTTP Upgrade mechanism is used only for cleartext HTTP2 (h2c).