HTTPD(8)

NAME

httpd, echo, save, imagemap, man2html − HTTP server

SYNOPSIS

ip/httpd/httpd [-a srvaddr] [-d domain] [-n namespace] [-w webroot]

ip/httpd/echo [-b inbuf] [-d domain] [-r remoteip] [-w webroot] [-N netdir] method version uri [search]

ip/httpd/save [-b inbuf] [-d domain] [-r remoteip] [-w webroot] [-N netdir] method version uri [search]

ip/httpd/imagemap [-b inbuf] [-d domain] [-r remoteip] [-w webroot] [-N netdir] method version uri

ip/httpd/man2html [-b inbuf] [-d domain] [-r remoteip] [-w webroot] [-N netdir] method version uri [search]

DESCRIPTION

Httpd serves the webroot directory of the file system described by namespace (default /lib/namespace.httpd), using version 1.1 of the HTTP protocol. It announces the service srvaddr (default tcp!∗!http), and listens for incoming calls.

Httpd supports only the GET and HEAD methods of the HTTP protocol; some magic programs support POST as well. Persistent connections are supported for HTTP/1.1 or later clients; all connections close after a magic command is executed. The Content-type (default application/octet-stream) and Content-encoding (default binary) of a file are determined by looking for suffixes of the file name in /sys/lib/mimetype.

Each requested URI is looked up in a redirection table, read from /sys/lib/httpd.rewrite. If a prefix of the URI matches a redirection path, the URI is rewritten using a replacement path, and a redirect is sent to the HTTP client. If the replacement path does not specify a server name, and the request has no explicit host, then domain is the host name used in the redirection.

The redirection table also maps a URI into an authentication realm. If a prefix of the URI matches a realm, the server negotiates a basic authentication with the client. The client’s credentials are checked by calling httpauth (see auth(2)), passing the realm and the client’s supplied password as arguments.

If the requested URI begins with /magic/server/, httpd executes the file /bin/ip/httpd/server to finish servicing the request. Method and version are those received on the first line of the request. Uri is the remaining portion of the requested URI. Inbuf contains the rest of the bytes read by the server, and netdir is the network directory for the connection. There are routines for processing command arguments, parsing headers, etc. in the httpd library, /sys/src/cmd/ip/httpd/libhttpd.a.$O. See httpd.h in that directory and existing magic commands for more details.

Echo is a trivial server that just returns the method, URI, any search, the headers, and the message body sent by the client.

Save writes a line to /usr/web/save/uri.data and returns the contents of /usr/web/save/uri.html. Both files must be accessible for the request to succeed. The saved line includes the current time and either the search string from a HEAD or GET or the first line of the body from a POST. It is used to record form submissions.

Imagemap processes an HTML imagemap query. It looks up a the point search in the image map file given by uri, and returns a redirection to the appropriate page. The map file defaults to NCSA format. Any entries after a line starting with the word #cern are interpreted in CERN format.

Man2html converts man(6) format manual pages into html. It includes some abilities to search the manuals.

FILES

/sys/lib/mimetype content type description file

/lib/namespace.httpd
default namespace file for httpd

/sys/lib/httpd.rewrite
redirection file

SOURCE

/sys/src/cmd/ip/httpd

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