Matt S Trout > Web-Simple > Web::Dispatch::HTTPMethods

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NAME ^

Web::Dispatch::HTTPMethods - Helpers to make RESTFul Dispatchers Easier

SYNOPSIS ^

    package MyApp:WithHTTPMethods;

    use Web::Simple;
    use Web::Dispatch::HTTPMethods;

    sub as_text {
      [200, ['Content-Type' => 'text/plain'],
        [$_[0]->{REQUEST_METHOD}, $_[0]->{REQUEST_URI}] ]
    }

    sub dispatch_request {
      sub (/get) {
        GET { as_text(pop) }
      },
      sub (/get-head) {
        GET { as_text(pop) }
        HEAD { [204,[],[]] },
      },
      sub (/get-post-put) {
        GET { as_text(pop) }  ## NOTE: no commas separating http methods
        POST { as_text(pop) }
        PUT { as_text(pop) }
      },
    }

DESCRIPTION ^

Exports the most commonly used HTTP methods as subroutine helps into your Web::Simple based application. Additionally adds an automatic HTTP code 405 Method Not Allow if none of the HTTP methods match for a given dispatch and also adds a dispatch rule for HEAD if no HEAD exists but a GET does (in which case the HEAD returns the GET dispatch with an empty body.)

We also add at the end of the chain support for the OPTIONS method (if you do not add one yourself. This defaults to http 200 ok + Allows http headers.

Also we try to set correct HTTP headers such as Allows as makes sense based on your dispatch chain.

The following dispatch chains are basically the same:

    sub dispatch_request {
      sub (/get-http-methods) {
        GET { [200, ['Content-Type' => 'text/plain'], ['Hello World']] }
      },
      sub(/get-classic) {
        sub (GET) { [200, ['Content-Type' => 'text/plain'], ['Hello World']] },
        sub (HEAD)  { [200, ['Content-Type' => 'text/plain'], []] },
        sub (OPTIONS)  {
          [200, ['Content-Type' => 'text/plain', Allows=>'GET,HEAD,OPTIONS'], []];
        },
        sub () {
          [405, ['Content-Type' => 'text/plain', Allows=>'GET,HEAD,OPTIONS'], 
           ['Method Not Allowed']]
        },
      }
    }

The idea here is less boilerplate to distract the reader from the main point of the code and also to encapsulate some best practices.

NOTE You currently cannot mix http method style and prototype sub style in the same scope, as in the following example:

    sub dispatch_request {
      sub (/get-head) {
        GET { ... }
        sub (HEAD) { ... }
      },
    }

If you try this our code will notice and issue a die. If you have a good use case please bring it to the authors.

EXPORTS

This automatically exports the following subroutines:

    GET
    PUT
    POST
    HEAD
    DELETE
    OPTIONS

AUTHOR ^

See Web::Simple for AUTHOR

CONTRIBUTORS ^

See Web::Simple for CONTRIBUTORS

COPYRIGHT ^

See Web::Simple for COPYRIGHT

LICENSE ^

See Web::Simple for LICENSE

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