PICARD-1359: improve builtin server reliability and debugging output

picard/browser/browser.py

@@ -65,11 +65,18 @@ class BrowserIntegration(QtNetwork.QTcpServer):
 
     def _process_request(self):
         conn = self.sender()
-        line = bytes(conn.readLine()).decode()
         conn.write(b"HTTP/1.1 200 OK\r\nCache-Control: max-age=0\r\n\r\nNothing to see here.")
-        conn.disconnectFromHost()
+        rawline = conn.readLine().data()
+        log.debug("Browser integration request: %r", rawline)
+        try:
+            line = rawline.decode()
+        except UnicodeDecodeError as e:
+            log.error(e)
+            return
+        finally:
+            conn.disconnectFromHost()
+
         line = line.split()
-        log.debug("Browser integration request: %r", line)
         if line[0] == "GET" and "?" in line[1]:
             action, args = line[1].split("?")
             args = [a.split("=", 1) for a in args.split("&")]