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HTTP is a request / response protocol, designed to serve hypertext documents in the WWW, typocally on Port-80-tcp.
Hypertext combines text with references to other content (URLs, graphics, etc), the most important format is HTML.

Today HTTP and its secure variant and successor HTTPS are the most important protocols in the net.
Most content in the net is served by one of these protocols.

The RFCs linked above are the current standards for HTTP 1.1, 2.0 and 3.0. Older versions are declared obsolete.
There are many further standards defining extensions, see the Wikipedia articles.

HTTP consists of a textual header defined in the standards and a body which can be empty or have arbitary content.
Each header line is terminated by a CRLF (\r\n), the complete header is terminated by 2 CRLFs (an empty line).

The first line of a HTTP request contains the request method, the location of the document and the HTTP version. Further header lines are Keyword: Value assignments. A minimalistic request looks like this:

GET /path/to/document HTTP/1.1
Host: fritz.box

The first line of a HTTP response contains the HTTP version, the numerical status code and the status message. Further header lines are also Keyword: Value assignments. A minimalistic response looks like this:

HTTP/1.1 200 OK
Connection: close
Content-Length: 12
Content-Type: text/plain; charset=utf-8

Hello world!

Content-Type: contains the MIME type and Charset used (here UTF-8 text) so the client knows how to treat the content.


FRITZ!OS uses HTTP for many services:


telnet can be used to type a HTTP request manually. Note the empty line to terminate the request header. fw 7.29:

me@home:~$ telnet fritz.box 80
Connected to fritz.box.
Escape character is '^]'.
GET / HTTP/1.1
Host: fritz.box

HTTP/1.1 200 OK
Cache-Control: no-cache
Cache-Control: no-cache, no-store, must-revalidate
Connection: Keep-Alive
Transfer-Encoding: chunked
Content-Type: text/html; charset=utf-8
Date: Fri, 05 Aug 2022 08:47:07 GMT
Expires: -1
Pragma: no-cache
Keep-Alive: timeout=60, max=300
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 1; mode=block
X-Content-Type-Options: nosniff
Content-Security-Policy: default-src 'none'; connect-src 'self'; font-src 'self'; frame-src https://service.avm.de https://help.avm.de https://www.avm.de https://avm.de https://assets.avm.de https://clickonce.avm.de http://clickonce.avm.de http://download.avm.de https://download.avm.de 'self'; img-src 'self' https://tv.avm.de https://help.avm.de/images/ http://help.avm.de/images/ data:; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; frame-ancestors 'self'; media-src 'self'

<!DOCTYPE html>
<html lang="de">


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