Support the bash debugger

This required working around some sort of bug where the server returns
an invalid content length. Either that or we are somehow processing the
same message twice with additional escaping? It's really strange.

python3/vimspector/debug_adapter_connection.py

@@ -80,24 +80,34 @@ class DebugAdapterConnection( object ):
     self._Write( data )
 
   def _ReadHeaders( self ):
-    headers = self._buffer.split( bytes( '\r\n\r\n', 'utf-8' ), 1 )
+    parts = self._buffer.split( bytes( '\r\n\r\n', 'utf-8' ), 1 )
 
-    if len( headers ) > 1:
-      for header_line in headers[ 0 ].split( bytes( '\r\n', 'utf-8' ) ):
+    if len( parts ) > 1:
+      headers = parts[ 0 ]
+      for header_line in headers.split( bytes( '\r\n', 'utf-8' ) ):
         if header_line.strip():
           key, value = str( header_line, 'utf-8' ).split( ':', 1 )
           self._headers[ key ] = value
 
       # Chomp (+4 for the 2 newlines which were the separator)
       # self._buffer = self._buffer[ len( headers[ 0 ] ) + 4 : ]
-      self._buffer = headers[ 1 ]
+      self._buffer = parts[ 1 ]
       self._SetState( 'READ_BODY' )
       return
 
     # otherwise waiting for more data
 
   def _ReadBody( self ):
-    content_length = int( self._headers[ 'Content-Length' ] )
+    try:
+      content_length = int( self._headers[ 'Content-Length' ] )
+    except KeyError:
+      # Ug oh. We seem to have all the headers, but no Content-Length
+      # Skip to reading headers. Because, what else can we do.
+      self._logger.error( 'Missing Content-Length header in: {0}'.format(
+        json.dumps( self._headers ) ) )
+      self._buffer = bytes( '', 'utf-8' )
+      self._SetState( 'READ_HEADER' )
+      return
 
     if len( self._buffer ) < content_length:
       # Need more data