HTTPD(8) 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. Persis-
tent connections are supported for HTTP/1.1 or later
clients; all connections close after a magic command is exe-
cuted. The Content-type (default application/octet-stream)
and Content-encoding (default binary) of a file are deter-
mined 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 pass-
word as arguments.
HTTPD(8) HTTPD(8)
If the requested URI begins with /magic/server/, httpd exe-
cutes 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 con-
nection. There are routines for processing command argu-
ments, 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
SEE ALSO
newns in auth(2), listen(8)