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na_http - HyperText Transfer Protocol


The node supports the HTTP/1.0 protocol, which is documented in the Internet Engineering Task Force (IETF) RFC 1945 titled "HyperText Transfer Protocol --HTTP/1.0."

HTTP is the primary Internet protocol used for transferring documents on the World Wide Web. It is a simple ASCII text request/response protocol. An HTTP request consists of a method, a target Web address or URL (Uniform Resource Locator), a protocol version identifier, and a set of headers. The method specifies the type of operation. For example, the GET method is used to retrieve a document. The POST method is used to submit a form. Headers contain additional information to the request in the form of simple name-value pairs. The HTTP header section is similar to Multipurpose Internet Mail Extensions (MIME).

The GET method is the most commonly used HTTP method. GET is used to retrieve a single resource, for example, an HTML document, image file, or other type of object, or part of it. By appending an If-modified-since header to the GET request, the document is retrieved conditionally, based on whether it has been modified since the date specified in the header.

An HTTP response consists of a protocol version identifier, a status code, a text response status line, response headers, and the contents of the requested document.

Access for http can be restricted by the options httpd.access command. Please see na_protocolaccess(8) for details.


The following is an example of use of the GET method:

  GET HTTP/1.0
  If-modified-since: Fri, 31 Dec 1999 15:45:12 GMT


na_httpstat(1), na_protocolaccess(8)

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