KES777

use Mojo::Base -strict;
use Test::Mojo;
use Test::More;

use Mojolicious::Lite;

app->defaults( handler => 'my_handler' );

get '/example' => sub{ die };
hook before_render => sub {

KES777

use Mojolicious::Lite;
use Test::Mojo;
use Test::More;

hook before_render => sub {
  my ($c, $args) = @_;
  @$args{qw(text format)} = ($args->{exception}, 'txt')
    if ($args->{template} // '') eq 'exception' && $c->accepts('txt');
};

KES777

DESCRIPTION OF THE PROBLEM

	use Mojolicious::Lite;
	use Test::Mojo;
	use Test::More;

	get '/test' => { format => 'xxx' };

	my $t = Test::Mojo->new;

KES777

Initial problem:

	use Mojolicious::Lite;
	use Test::Mojo;
	use Test::More;

	get '/test' => { format => 'xxx' };

	my $t = Test::Mojo->new;

KES777

Mojolicious content negotiation gotchas

Let's begin with parts which participate in content negotiation.
First of all there are client requirements and server capabilities.

This is obvious that we should prefer client requirements over server capabilies by default. And, if server (controller's action) wants, it may force {format}.

So picture is next by precedence:

  1. Controller's action format preferences

KES777

use Mojolicious::Lite;
use Test::Mojo;
use Test::More;

app->defaults( format => 'zzz', template => 'test' );

get '/app';

get '/route' => { format => 'xxx' };

KES777

>Rails picks up the expected format from the query parameter format, or if not there from the URL path suffix, or it not there from the Accept header

Blog post: https://dzone.com/articles/rest-with-rails-part-2-serving

>format query parameter is useful for rendering JSON output from a web browser without
special tools to modify the Accept header

IBM knowledge base: https://www.ibm.com/support/knowledgecenter/en/SS4GCC_6.1.1/com.ibm.urelease.doc/topics/rest_api_ref_conventions.html

>However, if a request uses multiple methods simultaneously,

KES777

...
sub startup {
   ...
   $app->hook( before_render  =>  sub{
     my( $c, $args ) =  @_;

	   my $theme =  $c->stash->{ theme } // '';
	   $args->{template} =  "$theme/$args->{template}";

     # But here we get two problems:

KES777

diff --git a/lib/Mojolicious/Lite.pm b/lib/Mojolicious/Lite.pm
index cf3cd04..21277fb 100644
--- a/lib/Mojolicious/Lite.pm
+++ b/lib/Mojolicious/Lite.pm
@@ -46,9 +46,6 @@ sub import {
     plugin => sub { $app->plugin(@_) },
     under  => sub { $routes = $root->under(@_) };
 
-  # Make sure there's a default application for testing
-  Mojo::UserAgent::Server->app($app) unless Mojo::UserAgent::Server->app;

KES777

use Mojolicious::Lite;

package Lite;
use Mojolicious::Lite;

get '/bye' =>  sub{ shift->render( text => 'OK' ) };


package main;