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.\"
.IX Title "Plack::Middleware::MethodOverride 3pm"
.TH Plack::Middleware::MethodOverride 3pm "2015-08-15" "perl v5.20.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "Name"
.IX Header "Name"
Plack::Middleware::MethodOverride \- Override \s-1REST\s0 methods to Plack apps via \s-1POST\s0
.SH "Version"
.IX Header "Version"
version 0.15
.SH "Synopsis"
.IX Header "Synopsis"
In your Plack app:
.PP
.Vb 5
\&  use Plack::Builder;
\&  builder {
\&      enable MethodOverride;
\&      $app;
\&  };
.Ve
.PP
\&\s-1PUT\s0 via a query parameter in your \s-1POST\s0 forms:
.PP
.Vb 3
\&  <form method="POST" action="/foo?x\-tunneled\-method=PUT">
\&    <!\-\- ... \-\->
\&  </form>
.Ve
.PP
Or override it via the \f(CW\*(C`X\-HTTP\-Method\-Override\*(C'\fR header in a request:
.PP
.Vb 3
\&  my $req = HTTP::Request\->new(POST => \*(Aq/foo\*(Aq, [
\&      \*(AqX\-HTTP\-Method\-Override\*(Aq => \*(AqPUT\*(Aq
\&  ]);
.Ve
.SH "Description"
.IX Header "Description"
Writing
\&\s-1REST\s0 <http://en.wikipedia.org/wiki/Representational_State_Transfer>ful apps
is a good thing, but if you're also trying to support web browsers, it would
be nice not to be reduced to \f(CW\*(C`GET\*(C'\fR and \f(CW\*(C`POST\*(C'\fR for everything.
.PP
This middleware allows for \f(CW\*(C`POST\*(C'\fR requests that pretend to be something else:
by adding either a header named \f(CW\*(C`X\-HTTP\-Method\-Override\*(C'\fR to the request, or
a query parameter named \f(CW\*(C`x\-tunneled\-method\*(C'\fR to the \s-1URI,\s0 the client can say
what method it actually meant. That is, as long as it meant one of these:
.IP "\(bu" 4
\&\s-1GET\s0
.IP "\(bu" 4
\&\s-1POST\s0
.IP "\(bu" 4
\&\s-1HEAD\s0
.IP "\(bu" 4
\&\s-1PUT\s0
.IP "\(bu" 4
\&\s-1DELETE\s0
.IP "\(bu" 4
\&\s-1OPTIONS\s0
.IP "\(bu" 4
\&\s-1TRACE\s0
.IP "\(bu" 4
\&\s-1CONNECT\s0
.IP "\(bu" 4
\&\s-1PATCH\s0
.PP
If so, then the \f(CW\*(C`REQUEST_METHOD\*(C'\fR in the \s-1PSGI\s0 environment will be replaced
with the client's desired value. The original request method is always stored
under the \f(CW\*(C`plack.original_request_method\*(C'\fR key.
.SH "Configuration"
.IX Header "Configuration"
These are the named arguments you can pass to \f(CW\*(C`new\*(C'\fR. Or, more likely, on the
\&\f(CW\*(C`enable\*(C'\fR line in your \f(CW\*(C`builder\*(C'\fR block, as in
.PP
.Vb 1
\&   enable \*(AqMethodOverride\*(Aq, header => \*(AqX\-HTTP\-Method\*(Aq, param => \*(Aqmy_method\*(Aq;
.Ve
.ie n .SS """header"""
.el .SS "\f(CWheader\fP"
.IX Subsection "header"
Specifies the \s-1HTTP\s0 header name which specifies the overriding \s-1HTTP\s0 method.
.PP
Defaults to \f(CW\*(C`X\-HTTP\-Method\-Override\*(C'\fR, as used by Google for its APIs.
.ie n .SS """param"""
.el .SS "\f(CWparam\fP"
.IX Subsection "param"
Specifies the query parameter name to specify the overriding \s-1HTTP\s0 method.
.PP
Defaults to \f(CW\*(C`x\-tunneled\-method\*(C'\fR.
.SH "Acknowledgements"
.IX Header "Acknowledgements"
This module gleefully steals from
Catalyst::TraitFor::Request::REST::ForBrowsers by Dave Rolsky and the
original version by Tatsuhiko Miyagawa (which in turn stole from
HTTP::Engine::Middleware::MethodOverride). Thanks to Aristotle
Pagaltzis <http://plasmasturm.org/> for the shove in this direction, to Matt
S Trout <http://www.trout.me.uk/> for suggesting that it be implemented as
middleware, and to Hans Dieter Pearcey <http://www.weftsoar.net/> for
convincing me not to parse body parameters.
.SH "Authors"
.IX Header "Authors"
.IP "\(bu" 4
Tatsuhiko Miyagawa <miyagawa@bulknews.net>
.IP "\(bu" 4
David E. Wheeler <david@justatheory.com>
.IP "\(bu" 4
Aristotle Pagaltzis <pagaltzis@gmx.de>
.SH "Copyright and License"
.IX Header "Copyright and License"
This software is copyright (c) 2015 by Tatsuhiko Miyagawa, David E. Wheeler, Aristotle Pagaltzis.
.PP
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.