Tcl API Reference -- ns_register_proc

### ns_register_proc

#### Overview

Register one or two procedures for a method/URL combination

#### Syntax

ns_register_proc ?-noinherit? method URL procname ?args?

proc procname {?conn? args} {

...

}

#### Description

ns_register_proc registers the procname to handle the specified method/URL combination. When the server gets a matching request, it calls procname with the connection id and any arguments specified here.

If -noinherit is specified, the requested URL must match the specified URL exactly. For example, if the URL specified with ns_register_proc is /foo/bar, procname will not be called unless the requested URL is exactly /foo/bar.

If -noinherit is not specified, the requested URL can match the specified URL or any URL below it. For example, if the URL specified with ns_register_proc is /foo/bar, procname will be called for /foo/bar, /foo/bar/hmm, and any other URL below /foo/bar, provided there is not already another procedure registered for that exact URL or for an URL with a closer match.

Note that you must use a glob-style matching character if you want inheritance for file names. For example, if you want /foo/bar to match /foo/bar.html, you must use:

        ns_register_proc /foo/bar*

You can register two procedures for any given method/URL combination by calling ns_register_proc once with the -noinherit flag set and once without it. Only one of the procedures will be called for any given request, depending on whether the URL was an exact match or not. For example:

          ns_register_proc -noinherit GET /foo/bar Aproc
          ns_register_proc GET /foo/bar Bproc
          ns_register_proc GET /foo/bar/hmm Cproc

Aproc will be called when the requested URL is exactly /foo/bar. Bproc will be called when the requested URL is below /foo/bar, provided there is not already another procedure registered to be called for that exact URL or for an URL with a closer match. Cproc (not Bproc) will be called when the requested URL is equal to or below /foo/bar/hmm.

#### Syntax for the registered procedure:

The conn (connection) argument is optional for procedures registered by ns_register_proc if the procedure has 0 or 1 arguments (not including conn). The following examples show the variations that can be used in this case:

        ns_register_proc GET /noargs noargs
        ns_register_proc GET /context context fnord
        ns_register_proc GET /conncontext conncontext greeble
        proc noargs { } {
            ns_returnnotice 200 "noargs"
        } ;# noargs
        proc context { context } {
            ns_returnnotice 200 "context is $context"
        } ;# context
        proc conncontext { conn context } {
            ns_returnnotice 200 "conncontext is $context"
        } ;# conncontext

The conn (connection) argument is required for procedures registered by ns_register_proc if the procedure has 2 or more arguments (not including conn). The conn argument will be filled automatically with the connection information. The first argument following conn will always take the value supplied by ns_register_proc, if there is one, or an empty value. All other arguments must supply a default value. The following examples show the variations that can be used in this case:

        ns_register_proc GET /twoargs twoargs fnord
        ns_register_proc GET /threeargs threeargs fnord fjord
        proc twoargs { conn context { greeble bork } } {
           ...
        } ;
        proc threeargs { conn context {greeble bork } { hoover quark } {
        ...
        } ;

When a GET of /twoargs is requested, the conn argument will be filled automatically, the context argument will be assigned "fnord" and the greeble argument will be assigned the default value "bork".

When a GET of /threeargs is requested, the conn argument will be filled automatically, the context argument will be assigned "fnord" and the greeble argument will be assigned "fjord", and the hoover argument will be assigned the default value "quark".

#### See Also

Ns_RegisterRequest (C API), Ns_UnRegisterRequest (C API)

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