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Mojolicious::Guides::TUseriContributed Perl Mojolicious::Guides::Tutorial(3pm)

NAME
       Mojolicious::Guides::Tutorial - Get started with Mojolicious

TUTORIAL
       A quick example-driven introduction to the wonders of
       Mojolicious::Lite. Almost everything you'll learn here also applies to
       full Mojolicious applications.

       This is only the first of the Mojolicious::Guides. Other guides delve
       deeper into topics like growing a Mojolicious::Lite prototype into a
       well-structured Mojolicious application, routing, rendering and more.
       It is highly encouraged that readers continue on to the remaining
       guides after reading this one.

   Hello World
       A simple Hello World application can look like this, strict, warnings,
       utf8 and Perl 5.16 features are automatically enabled and a few
       functions imported, when you use Mojolicious::Lite, turning your script
       into a full featured web application.

         #!/usr/bin/env perl
         use Mojolicious::Lite -signatures;

         get '/' => sub ($c) {
           $c->render(text => 'Hello World!');
         };

         app->start;

       With Mojolicious::Command::Author::generate::lite_app there is also a
       helper command to generate a small example application.

         $ mojo generate lite-app myapp.pl

   Commands
       Many different commands are automatically available from the command
       line. CGI and PSGI environments can even be detected and will usually
       just work without commands.

         $ ./myapp.pl daemon
         Web application available at http://127.0.0.1:3000

         $ ./myapp.pl daemon -l http://*:8080
         Web application available at http://127.0.0.1:8080

         $ ./myapp.pl cgi
         ...CGI output...

         $ ./myapp.pl get /
         Hello World!

         $ ./myapp.pl
         ...List of available commands (or automatically detected environment)...

       A call to "start" in Mojolicious ("app->start"), which starts the
       command system, should be the last expression in your application,
       because its return value can be significant.

         # Use @ARGV to pick a command
         app->start;

         # Start the "daemon" command
         app->start('daemon', '-l', 'http://*:8080');

   Reloading
       Your application will automatically reload itself if you start it with
       the morbo development web server, so you don't have to restart the
       server after every change.

         $ morbo ./myapp.pl
         Web application available at http://127.0.0.1:3000

       For more information about how to deploy your application see also
       "DEPLOYMENT" in Mojolicious::Guides::Cookbook.

   Routes
       Routes are basically just fancy paths that can contain different kinds
       of placeholders and usually lead to an action, if they match the path
       part of the request URL. The first argument passed to all actions ($c)
       is a Mojolicious::Controller object, containing both the HTTP request
       and response.

         use Mojolicious::Lite -signatures;

         # Route leading to an action that renders some text
         get '/foo' => sub ($c) {
           $c->render(text => 'Hello World!');
         };

         app->start;

       Response content is often generated by actions with "render" in
       Mojolicious::Controller, but more about that later.

   GET/POST parameters
       All "GET" and "POST" parameters sent with the request are accessible
       via "param" in Mojolicious::Controller.

         use Mojolicious::Lite -signatures;

         # /foo?user=sri
         get '/foo' => sub ($c) {
           my $user = $c->param('user');
           $c->render(text => "Hello $user.");
         };

         app->start;

   Stash and templates
       The "stash" in Mojolicious::Controller is used to pass data to
       templates, which can be inlined in the "DATA" section.  A few stash
       values like "template", "text" and "data" are reserved and will be used
       by "render" in Mojolicious::Controller to decide how a response should
       be generated.

         use Mojolicious::Lite -signatures;

         # Route leading to an action that renders a template
         get '/foo' => sub ($c) {
           $c->stash(one => 23);
           $c->render(template => 'magic', two => 24);
         };

         app->start;
         __DATA__

         @@ magic.html.ep
         The magic numbers are <%= $one %> and <%= $two %>.

       For more information about templates see also "Embedded Perl" in
       Mojolicious::Guides::Rendering.

   HTTP
       "req" in Mojolicious::Controller and "res" in Mojolicious::Controller
       give you full access to all HTTP features and information.

         use Mojolicious::Lite -signatures;

         # Access request information
         get '/agent' => sub ($c) {
           my $host = $c->req->url->to_abs->host;
           my $ua   = $c->req->headers->user_agent;
           $c->render(text => "Request by $ua reached $host.");
         };

         # Echo the request body and send custom header with response
         post '/echo' => sub ($c) {
           $c->res->headers->header('X-Bender' => 'Bite my shiny metal ass!');
           $c->render(data => $c->req->body);
         };

         app->start;

       You can test the more advanced examples right from the command line
       with Mojolicious::Command::get.

         $ ./myapp.pl get -v -M POST -c 'test' /echo

   JSON
       JSON is the most commonly used data-interchange format for web
       services. Mojolicious loves JSON and comes with the possibly fastest
       pure-Perl implementation Mojo::JSON built right in, which is accessible
       through "json" in Mojo::Message as well as the reserved stash value
       "json".

         use Mojolicious::Lite -signatures;

         # Modify the received JSON document and return it
         put '/reverse' => sub ($c) {
           my $hash = $c->req->json;
           $hash->{message} = reverse $hash->{message};
           $c->render(json => $hash);
         };

         app->start;

       You can send JSON documents from the command line with
       Mojolicious::Command::get.

         $ ./myapp.pl get -M PUT -c '{"message":"Hello Mojo!"}' /reverse

   Built-in "exception" and "not_found" pages
       During development you will encounter these pages whenever you make a
       mistake, they are gorgeous and contain a lot of valuable information
       that will aid you in debugging your application.

         use Mojolicious::Lite -signatures;

         # Not found (404)
         get '/missing' => sub ($c) {
           $c->render(template => 'does_not_exist');
         };

         # Exception (500)
         get '/dies' => sub { die 'Intentional error' };

         app->start;

       You can even use CSS selectors with Mojolicious::Command::get to
       extract only the information you're actually interested in.

         $ ./myapp.pl get /dies '#error'

       And don't worry about revealing too much information on these pages,
       they are only available during development, and will be replaced
       automatically with pages that don't reveal any sensitive information in
       a production environment.

   Route names
       All routes can have a name associated with them, this allows automatic
       template detection and backreferencing with "url_for" in
       Mojolicious::Controller, on which many methods and helpers like
       "link_to" in Mojolicious::Plugin::TagHelpers rely.

         use Mojolicious::Lite -signatures;

         # Render the template "index.html.ep"
         get '/' => sub ($c) {
           $c->render;
         } => 'index';

         # Render the template "hello.html.ep"
         get '/hello';

         app->start;
         __DATA__

         @@ index.html.ep
         <%= link_to Hello  => 'hello' %>.
         <%= link_to Reload => 'index' %>.

         @@ hello.html.ep
         Hello World!

       Nameless routes get an automatically generated one assigned that is
       simply equal to the route itself without non-word characters.

   Layouts
       Templates can have layouts too, you just select one with the helper
       "layout" in Mojolicious::Plugin::DefaultHelpers and place the result of
       the current template with the helper "content" in
       Mojolicious::Plugin::DefaultHelpers.

         use Mojolicious::Lite;

         get '/with_layout';

         app->start;
         __DATA__

         @@ with_layout.html.ep
         % title 'Green';
         % layout 'green';
         Hello World!

         @@ layouts/green.html.ep
         <!DOCTYPE html>
         <html>
           <head><title><%= title %></title></head>
           <body><%= content %></body>
         </html>

       The stash or helpers like "title" in
       Mojolicious::Plugin::DefaultHelpers can be used to pass additional data
       to the layout.

   Blocks
       Template blocks can be used like normal Perl functions and are always
       delimited by the "begin" and "end" keywords, they are the foundation
       for many helpers.

         use Mojolicious::Lite;

         get '/with_block' => 'block';

         app->start;
         __DATA__

         @@ block.html.ep
         % my $link = begin
           % my ($url, $name) = @_;
           Try <%= link_to $url => begin %><%= $name %><% end %>.
         % end
         <!DOCTYPE html>
         <html>
           <head><title>Sebastians frameworks</title></head>
           <body>
             %= $link->('http://mojolicious.org', 'Mojolicious')
             %= $link->('http://mojojs.org', 'mojo.js')
           </body>
         </html>

   Helpers
       Helpers are little functions you can create with the keyword "helper"
       in Mojolicious::Lite and reuse throughout your whole application, from
       actions to templates.

         use Mojolicious::Lite -signatures;

         # A helper to identify visitors
         helper whois => sub ($c) {
           my $agent = $c->req->headers->user_agent || 'Anonymous';
           my $ip    = $c->tx->remote_address;
           return "$agent ($ip)";
         };

         # Use helper in action and template
         get '/secret' => sub ($c) {
           my $user = $c->whois;
           $c->app->log->debug("Request from $user");
         };

         app->start;
         __DATA__

         @@ secret.html.ep
         We know who you are <%= whois %>.

       A list of all built-in ones can be found in
       Mojolicious::Plugin::DefaultHelpers and
       Mojolicious::Plugin::TagHelpers.

   Plugins
       Plugins are application extensions that help with code sharing and
       organization. You can load a plugin with the keyword "plugin" in
       Mojolicious::Lite, which can omit the "Mojolicious::Plugin::" part of
       the name, and optionally provide configuration for the plugin.

         use Mojolicious::Lite;

         plugin Config => {file => '/etc/myapp.conf', default => {foo => 'bar'}};

         # Return configured foo value, or default if no configuration file
         get '/foo' => sub ($c) {
           my $foo = $c->app->config('foo');
           $c->render(json => {foo => $foo});
         };

         app->start;

       Mojolicious::Plugin::Config is a built-in plugin which can populate
       "config" in Mojolicious using a config file.  Plugins can also set up
       routes, hooks, handlers, or even load other plugins. A list of built-in
       plugins can be found at "PLUGINS" in Mojolicious::Plugins, and many
       more are available from CPAN
       <https://metacpan.org/search?q=Mojolicious+Plugin>.

   Placeholders
       Route placeholders allow capturing parts of a request path until a "/"
       or "." separator occurs, similar to the regular expression "([^/.]+)".
       Results are accessible via "stash" in Mojolicious::Controller and
       "param" in Mojolicious::Controller.

         use Mojolicious::Lite -signatures;

         # /foo/test
         # /foo/test123
         get '/foo/:bar' => sub ($c) {
           my $bar = $c->stash('bar');
           $c->render(text => "Our :bar placeholder matched $bar");
         };

         # /testsomething/foo
         # /test123something/foo
         get '/<:bar>something/foo' => sub ($c) {
           my $bar = $c->param('bar');
           $c->render(text => "Our :bar placeholder matched $bar");
         };

         app->start;

       To separate them from the surrounding text, you can surround your
       placeholders with "<" and ">", which also makes the colon prefix
       optional.

   Relaxed Placeholders
       Relaxed placeholders allow matching of everything until a "/" occurs,
       similar to the regular expression "([^/]+)".

         use Mojolicious::Lite;

         # /hello/test
         # /hello/test.html
         get '/hello/#you' => 'groovy';

         app->start;
         __DATA__

         @@ groovy.html.ep
         Your name is <%= $you %>.

   Wildcard placeholders
       Wildcard placeholders allow matching absolutely everything, including
       "/" and ".", similar to the regular expression "(.+)".

         use Mojolicious::Lite;

         # /hello/test
         # /hello/test123
         # /hello/test.123/test/123
         get '/hello/*you' => 'groovy';

         app->start;
         __DATA__

         @@ groovy.html.ep
         Your name is <%= $you %>.

   HTTP methods
       Routes can be restricted to specific request methods with different
       keywords like "get" in Mojolicious::Lite and "any" in
       Mojolicious::Lite.

         use Mojolicious::Lite -signatures;

         # GET /hello
         get '/hello' => sub ($c) {
           $c->render(text => 'Hello World!');
         };

         # PUT /hello
         put '/hello' => sub ($c) {
           my $size = length $c->req->body;
           $c->render(text => "You uploaded $size bytes to /hello.");
         };

         # GET|POST|PATCH /bye
         any ['GET', 'POST', 'PATCH'] => '/bye' => sub ($c) {
           $c->render(text => 'Bye World!');
         };

         # * /whatever
         any '/whatever' => sub ($c) {
           my $method = $c->req->method;
           $c->render(text => "You called /whatever with $method.");
         };

         app->start;

   Optional placeholders
       All placeholders require a value, but by assigning them default values
       you can make capturing optional.

         use Mojolicious::Lite -signatures;

         # /hello
         # /hello/Sara
         get '/hello/:name' => {name => 'Sebastian', day => 'Monday'} => sub ($c) {
           $c->render(template => 'groovy', format => 'txt');
         };

         app->start;
         __DATA__

         @@ groovy.txt.ep
         My name is <%= $name %> and it is <%= $day %>.

       Default values that don't belong to a placeholder simply get merged
       into the stash all the time.

   Restrictive placeholders
       A very easy way to make placeholders more restrictive are alternatives,
       you just make a list of possible values.

         use Mojolicious::Lite -signatures;

         # /test
         # /123
         any '/:foo' => [foo => ['test', '123']] => sub ($c) {
           my $foo = $c->param('foo');
           $c->render(text => "Our :foo placeholder matched $foo");
         };

         app->start;

       All placeholders get compiled to a regular expression internally, this
       process can also be customized. Just make sure not to use "^" and "$",
       or capturing groups "(...)", non-capturing groups "(?:...)" are fine
       though.

         use Mojolicious::Lite -signatures;

         # /1
         # /123
         any '/:bar' => [bar => qr/\d+/] => sub ($c) {
           my $bar = $c->param('bar');
           $c->render(text => "Our :bar placeholder matched $bar");
         };

         app->start;

       You can take a closer look at all the generated regular expressions
       with the command Mojolicious::Command::routes.

         $ ./myapp.pl routes -v

   Under
       Authentication and code shared between multiple routes can be realized
       easily with routes generated by "under" in Mojolicious::Lite. All
       following routes are only evaluated if the callback returned a true
       value.

         use Mojolicious::Lite -signatures;

         # Authenticate based on name parameter
         under sub ($c) {

           # Authenticated
           my $name = $c->param('name') || '';
           return 1 if $name eq 'Bender';

           # Not authenticated
           $c->render(template => 'denied');
           return undef;
         };

         # Only reached when authenticated
         get '/' => 'index';

         app->start;
         __DATA__

         @@ denied.html.ep
         You are not Bender, permission denied.

         @@ index.html.ep
         Hi Bender.

       Prefixing multiple routes is another good use for it.

         use Mojolicious::Lite;

         # /foo
         under '/foo';

         # /foo/bar
         get '/bar' => {text => 'foo bar'};

         # /foo/baz
         get '/baz' => {text => 'foo baz'};

         # / (reset)
         under '/' => {msg => 'whatever'};

         # /bar
         get '/bar' => {inline => '<%= $msg %> works'};

         app->start;

       You can also group related routes with "group" in Mojolicious::Lite,
       which allows nesting of routes generated with "under" in
       Mojolicious::Lite.

         use Mojolicious::Lite -signatures;

         # Global logic shared by all routes
         under sub ($c) {
           return 1 if $c->req->headers->header('X-Bender');
           $c->render(text => "You're not Bender.");
           return undef;
         };

         # Admin section
         group {

           # Local logic shared only by routes in this group
           under '/admin' => sub ($c) {
             return 1 if $c->req->headers->header('X-Awesome');
             $c->render(text => "You're not awesome enough.");
             return undef;
           };

           # GET /admin/dashboard
           get '/dashboard' => {text => 'Nothing to see here yet.'};
         };

         # GET /welcome
         get '/welcome' => {text => 'Hi Bender.'};

         app->start;

   Formats
       Formats can be automatically detected from file extensions like
       ".html", they are used to find the right template and generate the
       correct "Content-Type" header. Use a restrictive placeholder to declare
       the possible values.

         use Mojolicious::Lite -signatures;

         # /detection.html
         # /detection.txt
         get '/detection' => [format => ['html', 'txt']] => sub ($c) {
           $c->render(template => 'detected');
         };

         app->start;
         __DATA__

         @@ detected.html.ep
         <!DOCTYPE html>
         <html>
           <head><title>Detected</title></head>
           <body>HTML was detected.</body>
         </html>

         @@ detected.txt.ep
         TXT was detected.

       And just like with placeholders you can use a default value to make the
       format optional.

         use Mojolicious::Lite -signatures;

         # /hello
         # /hello.json
         # /hello.txt
         get '/hello' => [format => ['json', 'txt']] => {format => 'txt'} => sub ($c) {
           return $c->render(json => {hello => 'world'}) if $c->stash('format') eq 'json';
           $c->render(text => 'hello world');
         };

         app->start;

       The default format is "html" and the renderer will fall back to when
       necessary.

   Content negotiation
       For resources with different representations and that require truly
       RESTful content negotiation you can also use "respond_to" in
       Mojolicious::Plugin::DefaultHelpers.

         use Mojolicious::Lite -signatures;

         # /hello (Accept: application/json)
         # /hello (Accept: application/xml)
         # /hello.json
         # /hello.xml
         # /hello?_format=json
         # /hello?_format=xml
         get '/hello' => [format => ['json', 'xml']] => {format => undef} => sub ($c) {
           $c->respond_to(
             json => {json => {hello => 'world'}},
             xml  => {text => '<hello>world</hello>'},
             any  => {data => '', status => 204}
           );
         };

         app->start;

       MIME type mappings can be extended or changed easily with "types" in
       Mojolicious.

         app->types->type(rdf => 'application/rdf+xml');

   Static files
       Similar to templates, but with only a single file extension and
       optional Base64 encoding, static files can be inlined in the "DATA"
       section and are served automatically.

         use Mojolicious::Lite;

         app->start;
         __DATA__

         @@ something.js
         alert('hello!');

         @@ test.txt (base64)
         dGVzdCAxMjMKbGFsYWxh

       External static files are not limited to a single file extension and
       will be served automatically from a "public" directory if it exists.

         $ mkdir public
         $ mv something.js public/something.js
         $ mv mojolicious.tar.gz public/mojolicious.tar.gz

       Both have a higher precedence than routes for "GET" and "HEAD"
       requests. Content negotiation with "Range", "If-None-Match" and
       "If-Modified-Since" headers is supported as well and can be tested very
       easily with Mojolicious::Command::get.

         $ ./myapp.pl get /something.js -v -H 'Range: bytes=2-4'

   External templates
       External templates will be searched by the renderer in a "templates"
       directory if it exists.

         $ mkdir -p templates/foo
         $ echo 'Hello World!' > templates/foo/bar.html.ep

       They have a higher precedence than templates in the "DATA" section.

         use Mojolicious::Lite -signatures;

         # Render template "templates/foo/bar.html.ep"
         any '/external' => sub ($c) {
           $c->render(template => 'foo/bar');
         };

         app->start;

   Home
       You can use "home" in Mojolicious to interact with the directory your
       application considers its home. This is the directory it will search
       for "public" and "templates" directories, but you can use it to store
       all sorts of application specific data.

         $ mkdir cache
         $ echo 'Hello World!' > cache/hello.txt

       There are many useful methods Mojo::Home inherits from Mojo::File, like
       "child" in Mojo::File and "slurp" in Mojo::File, that will help you
       keep your application portable across many different operating systems.

         use Mojolicious::Lite -signatures;

         # Load message into memory
         my $hello = app->home->child('cache', 'hello.txt')->slurp;

         # Display message
         get '/' => sub ($c) {
           $c->render(text => $hello);
         };

       You can also introspect your application from the command line with
       Mojolicious::Command::eval.

         $ ./myapp.pl eval -v 'app->home'

   Conditions
       Conditions such as "agent" and "host" from
       Mojolicious::Plugin::HeaderCondition allow even more powerful route
       constructs.

         use Mojolicious::Lite -signatures;

         # Firefox
         get '/foo' => (agent => qr/Firefox/) => sub ($c) {
           $c->render(text => 'Congratulations, you are using a cool browser.');
         };

         # Internet Explorer
         get '/foo' => (agent => qr/Internet Explorer/) => sub ($c) {
           $c->render(text => 'Dude, you really need to upgrade to Firefox.');
         };

         # http://mojolicious.org/bar
         get '/bar' => (host => 'mojolicious.org') => sub ($c) {
           $c->render(text => 'Hello Mojolicious.');
         };

         app->start;

   Sessions
       Cookie-based sessions just work out of the box, as soon as you start
       using them through the helper "session" in
       Mojolicious::Plugin::DefaultHelpers. Just be aware that all session
       data gets serialized with Mojo::JSON and stored client-side, with a
       cryptographic signature to prevent tampering.

         use Mojolicious::Lite -signatures;

         # Access session data in action and template
         get '/counter' => sub ($c) {
           $c->session->{counter}++;
         };

         app->start;
         __DATA__

         @@ counter.html.ep
         Counter: <%= session 'counter' %>

       Note that you should use custom "secrets" in Mojolicious to make signed
       cookies really tamper resistant.

         app->secrets(['My secret passphrase here']);

   File uploads
       All files uploaded via "multipart/form-data" request are automatically
       available as Mojo::Upload objects from "param" in
       Mojolicious::Controller. And you don't have to worry about memory
       usage, because all files above 250KiB will be automatically streamed
       into a temporary file. To build HTML forms more efficiently, you can
       also use tag helpers like "form_for" in
       Mojolicious::Plugin::TagHelpers.

         use Mojolicious::Lite -signatures;

         # Upload form in DATA section
         get '/' => 'form';

         # Multipart upload handler
         post '/upload' => sub ($c) {

           # Check file size
           return $c->render(text => 'File is too big.', status => 200) if $c->req->is_limit_exceeded;

           # Process uploaded file
           return $c->redirect_to('form') unless my $example = $c->param('example');
           my $size = $example->size;
           my $name = $example->filename;
           $c->render(text => "Thanks for uploading $size byte file $name.");
         };

         app->start;
         __DATA__

         @@ form.html.ep
         <!DOCTYPE html>
         <html>
           <head><title>Upload</title></head>
           <body>
             %= form_for upload => (enctype => 'multipart/form-data') => begin
               %= file_field 'example'
               %= submit_button 'Upload'
             % end
           </body>
         </html>

       To protect you from excessively large files there is also a limit of
       16MiB by default, which you can tweak with the attribute
       "max_request_size" in Mojolicious.

         # Increase limit to 1GiB
         app->max_request_size(1073741824);

   User agent
       With Mojo::UserAgent, which is available through the helper "ua" in
       Mojolicious::Plugin::DefaultHelpers, there's a full featured HTTP and
       WebSocket user agent built right in. Especially in combination with
       Mojo::JSON and Mojo::DOM this can be a very powerful tool.

         use Mojolicious::Lite -signatures;

         # Blocking
         get '/headers' => sub ($c) {
           my $url = $c->param('url') || 'https://mojolicious.org';
           my $dom = $c->ua->get($url)->result->dom;
           $c->render(json => $dom->find('h1, h2, h3')->map('text')->to_array);
         };

         # Non-blocking
         get '/title' => sub ($c) {
           $c->ua->get('mojolicious.org' => sub ($ua, $tx) {
             $c->render(data => $tx->result->dom->at('title')->text);
           });
         };

         # Concurrent non-blocking
         get '/titles' => sub ($c) {
           my $mojo = $c->ua->get_p('https://mojolicious.org');
           my $cpan = $c->ua->get_p('https://metacpan.org');
           Mojo::Promise->all($mojo, $cpan)->then(sub ($mojo, $cpan) {
             $c->render(json => {
               mojo => $mojo->[0]->result->dom->at('title')->text,
               cpan => $cpan->[0]->result->dom->at('title')->text
             });
           })->wait;
         };

         app->start;

       For more information about the user agent see also "USER AGENT" in
       Mojolicious::Guides::Cookbook.

   WebSockets
       WebSocket applications have never been this simple before. Just receive
       messages by subscribing to events such as "json" in
       Mojo::Transaction::WebSocket with "on" in Mojolicious::Controller and
       return them with "send" in Mojolicious::Controller.

         use Mojolicious::Lite -signatures;

         websocket '/echo' => sub ($c) {
           $c->on(json => sub ($c, $hash) {
             $hash->{msg} = "echo: $hash->{msg}";
             $c->send({json => $hash});
           });
         };

         get '/' => 'index';

         app->start;
         __DATA__

         @@ index.html.ep
         <!DOCTYPE html>
         <html>
           <head>
             <title>Echo</title>
             <script>
               const ws = new WebSocket('<%= url_for('echo')->to_abs %>');
               ws.onmessage = function (event) {
                 document.body.innerHTML += JSON.parse(event.data).msg;
               };
               ws.onopen = function (event) {
                 ws.send(JSON.stringify({msg: 'I ♥ Mojolicious!'}));
               };
             </script>
           </head>
         </html>

       For more information about real-time web features see also "REAL-TIME
       WEB" in Mojolicious::Guides::Cookbook.

   Mode
       You can use the Mojo::Log object from "log" in Mojolicious to portably
       collect debug messages and automatically disable them later in a
       production setup by changing the Mojolicious operating mode, which can
       also be retrieved from the attribute "mode" in Mojolicious.

         use Mojolicious::Lite -signatures;

         # Prepare mode specific message during startup
         my $msg = app->mode eq 'development' ? 'Development!' : 'Something else!';

         get '/' => sub ($c) {
           $c->app->log->debug('Rendering mode specific message');
           $c->render(text => $msg);
         };

         app->log->debug('Starting application');
         app->start;

       The default operating mode will usually be "development" and can be
       changed with command line options or the "MOJO_MODE" and "PLACK_ENV"
       environment variables. A mode other than "development" will raise the
       log level from "trace" to "info". All messages will be written to
       "STDERR" by default.

         $ ./myapp.pl daemon -m production

       Mode changes also affect a few other aspects of the framework, such as
       the built-in "exception" and "not_found" pages. Once you switch modes
       from "development" to "production", no sensitive information will be
       revealed on those pages anymore.

   Testing
       Testing your application is as easy as creating a "t" directory and
       filling it with normal Perl tests like "t/basic.t", which can be a lot
       of fun thanks to Test::Mojo.

         use Test::More;
         use Mojo::File qw(curfile);
         use Test::Mojo;

         # Portably point to "../myapp.pl"
         my $script = curfile->dirname->sibling('myapp.pl');

         my $t = Test::Mojo->new($script);
         $t->get_ok('/')->status_is(200)->content_like(qr/Funky/);

         done_testing();

       Just run your tests with prove.

         $ prove -l -v
         $ prove -l -v t/basic.t

MORE
       You can continue with Mojolicious::Guides now or take a look at the
       Mojolicious wiki <https://github.com/mojolicious/mojo/wiki>, which
       contains a lot more documentation and examples by many different
       authors.

SUPPORT
       If you have any questions the documentation might not yet answer, don't
       hesitate to ask in the Forum <https://forum.mojolicious.org>, on Matrix
       <https://matrix.to/#/#mojo:matrix.org>, or IRC
       <https://web.libera.chat/#mojo>.

perl v5.36.0                      2022-12-22Mojolicious::Guides::Tutorial(3pm)

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