From 2d18b7ff9dc47aa6b492d671b4765173b63299fc Mon Sep 17 00:00:00 2001
From: Adam Thomason <ad@mthomason.net>
Date: Thu, 4 Aug 2011 16:11:48 -0700
Subject: [PATCH 1/3] Suppress 400 if client disconnected

---
 lib/Twiggy/Server.pm | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/Twiggy/Server.pm b/lib/Twiggy/Server.pm
index 579c884..debcd3d 100644
--- a/lib/Twiggy/Server.pm
+++ b/lib/Twiggy/Server.pm
@@ -160,7 +160,7 @@ sub _accept_handler {
 
             1;
         }) {
-            $self->_bad_request($sock);
+            $self->_bad_request($sock) unless $@ eq 'client disconnected';
         }
     };
 }
@@ -217,7 +217,7 @@ sub _create_req_parsing_watcher {
         } catch {
             undef $headers_io_watcher;
             undef $timeout_timer;
-            $self->_bad_request($sock);
+            $self->_bad_request($sock) unless $_ eq 'client disconnected';
         }
     };
 }

From d5e803ed310e2b993a195760153960c4529c04e7 Mon Sep 17 00:00:00 2001
From: Adam Thomason <ad@mthomason.net>
Date: Fri, 2 Sep 2011 11:44:09 -0700
Subject: [PATCH 2/3] Allow for error messages that have line numbers

---
 lib/Twiggy/Server.pm | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/Twiggy/Server.pm b/lib/Twiggy/Server.pm
index debcd3d..0978e2b 100644
--- a/lib/Twiggy/Server.pm
+++ b/lib/Twiggy/Server.pm
@@ -160,7 +160,7 @@ sub _accept_handler {
 
             1;
         }) {
-            $self->_bad_request($sock) unless $@ eq 'client disconnected';
+            $self->_bad_request($sock) unless $@ =~ /^client disconnected/;
         }
     };
 }
@@ -217,7 +217,7 @@ sub _create_req_parsing_watcher {
         } catch {
             undef $headers_io_watcher;
             undef $timeout_timer;
-            $self->_bad_request($sock) unless $_ eq 'client disconnected';
+            $self->_bad_request($sock) unless /^client disconnected/;
         }
     };
 }

From f9fbf8b99a4eb5cae433a1e68af46fd3bb31f44a Mon Sep 17 00:00:00 2001
From: Adam Thomason <ad@mthomason.net>
Date: Wed, 7 Sep 2011 17:16:51 -0700
Subject: [PATCH 3/3] On bad_request, go through _write_psgi_response even if
 sending nothing back

---
 lib/Twiggy/Server.pm | 26 +++++++++++++++-----------
 1 file changed, 15 insertions(+), 11 deletions(-)

diff --git a/lib/Twiggy/Server.pm b/lib/Twiggy/Server.pm
index 0978e2b..1741362 100644
--- a/lib/Twiggy/Server.pm
+++ b/lib/Twiggy/Server.pm
@@ -160,7 +160,8 @@ sub _accept_handler {
 
             1;
         }) {
-            $self->_bad_request($sock) unless $@ =~ /^client disconnected/;
+            my $disconnected = ($@ =~ /^client disconnected/);
+            $self->_bad_request($sock, $disconnected);
         }
     };
 }
@@ -217,24 +218,27 @@ sub _create_req_parsing_watcher {
         } catch {
             undef $headers_io_watcher;
             undef $timeout_timer;
-            $self->_bad_request($sock) unless /^client disconnected/;
+            my $disconnected = /^client disconnected/;
+            $self->_bad_request($sock, $disconnected);
         }
     };
 }
 
 sub _bad_request {
-    my ( $self, $sock ) = @_;
+    my ( $self, $sock, $disconnected ) = @_;
 
     return unless defined $sock and defined fileno $sock;
 
-    $self->_write_psgi_response(
-        $sock,
-        [
-            400,
-            [ 'Content-Type' => 'text/plain' ],
-            [ ],
-        ],
-    );
+    my $response = [
+        400,
+        [ 'Content-Type' => 'text/plain' ],
+        [ ],
+    ];
+
+    # if client is already gone, don't try to write to it
+    $response = [] if $disconnected;
+
+    $self->_write_psgi_response($sock, $response);
 
     return;
 }