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environ is a dictionary containing CGI environment variables as well as other request parameters and metadata under well-defined keys. [9] start_response is a callable itself, taking two positional parameters, status and response_headers. Line 2 calls start_response, specifying "200 OK" as the HTTP status and a "Content-Type" response header.
This class of status code indicates the client must take additional action to complete the request. Many of these status codes are used in URL redirection. [2] A user agent may carry out the additional action with no user interaction only if the method used in the second request is GET or HEAD. A user agent may automatically redirect a request.
Superseded by the traceparent header [45] X-Request-ID: f058ebd6-02f7-4d3f-942e-904344e8cde5: Save-Data [46] The Save-Data client hint request header available in Chrome, Opera, and Yandex browsers lets developers deliver lighter, faster applications to users who opt-in to data saving mode in their browser. Save-Data: on: Sec-GPC [47]
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).
The command above starts an HTTP server listening on port 5000 of every local interface and returns this 200 OK response to every HTTP request: HTTP / 1.0 200 OK Date : Fri, 19 Mar 2010 23:34:10 GMT Server : HTTP::Server::PSGI Content-Type : text/plain Content-Length : 13 Hello, world!
Duplicate names are not allowed in the request headers; RFC 2616-compliant header combining must already have taken place. The first request header must have the name "CONTENT_LENGTH" and a value that is the length of the body in decimal. The "CONTENT_LENGTH" request header must always be present, even if its value is "0".
HTTP / 1.0 200 OK Server: HTTPd/0.9 Date: Sun, 10 Apr 2005 20:27:03 GMT Content-Type: text/html Content-Length: 7984 (followed by a blank line and HTML text of the restricted page). The "response" value is calculated in three steps, as follows.
This is a set category.It should only contain pages that are Hypertext Transfer Protocol status codes or lists of Hypertext Transfer Protocol status codes, as well as subcategories containing those things (themselves set categories).