Apply BehindProxy middleware when behind_proxy is set

  set behind_proxy => 1;

We now 'use' the middleware directly rather than letting Plack::Builder
load it for us. May allow earlier version of Plack to be used as a dependency.

Author: veryrusty

lib/Dancer2/Core/App.pm

@@ -17,6 +17,7 @@ use Plack::Middleware::FixMissingBodyInRedirect;
 use Plack::Middleware::Head;
 use Plack::Middleware::Conditional;
 use Plack::Middleware::ConditionalGET;
+use Dancer2::Middleware::BehindProxy;
 
 use Dancer2::FileUtils 'path';
 use Dancer2::Core;
@@ -1419,10 +1420,15 @@ sub to_app {
 
     # Wrap with common middleware
     if ( ! $self->config->{'no_default_middleware'} ) {
+        # BehindProxy (this is not runtime configurable)
+        $self->config->{'behind_proxy'}
+            and $psgi = Dancer2::Middleware::BehindProxy->wrap($psgi);
+
         # FixMissingBodyInRedirect
-        $psgi = Plack::Middleware::FixMissingBodyInRedirect->wrap( $psgi );
+        $psgi = Plack::Middleware::FixMissingBodyInRedirect->wrap($psgi);
+
         # Apply Head. After static so a HEAD request on static content DWIM.
-        $psgi = Plack::Middleware::Head->wrap( $psgi );
+        $psgi = Plack::Middleware::Head->wrap($psgi);
     }
 
     return $psgi;

lib/Dancer2/Core/Runner.pm

@@ -7,7 +7,6 @@ use Module::Runtime 'require_module';
 use Dancer2::Core::MIME;
 use Dancer2::Core::Types;
 use Dancer2::Core::Dispatcher;
-use Plack::Builder qw();
 use Ref::Util qw< is_ref is_regexpref >;
 
 # Hashref of configurable items for the runner.