HeaderDebugPanel sometimes triggers an exception for no response.

[jvanasco]

HeaderDebugPanel sometimes triggers an exception for no response.

[mmerickel]

if you can reproduce this issue then the question is which codepath the request went through the tween in which self.process_response was not invoked. I'd put a breakpoint around [1] and step through until the response goes out.

[1]

pyramid_debugtoolbar/src/pyramid_debugtoolbar/toolbar.py

Line 246 in af65e64

request.pdtb_id = hexlify(id(request))

First of all, thanks for a great toolbar, it's been very useful.

I've been seeing this error occasionally as well. I just put a breakpoint at the place suggested by mmerickel above and got some more info: in my case the exception got triggered in https://github.com/Pylons/pyramid_debugtoolbar/blob/4.5/src/pyramid_debugtoolbar/toolbar.py#L75 . The panel_class(request) call failed due to an exception raised in panel_class.__init__().

In my case it turned out to be a UnicodeDecodeError exception in a custom panel's __init__(). Fixing this exception also fixed the issue with HeaderDebugPanel.

Note: the faulty custom panel's class was (way) after the HeaderDebugPanel class in the panel_classes list, so this part of the code should've already ran for HeaderDebugPanel, making me guess it's to do with some later code that doesn't run due to the raised exception. I didn't investigate any further.

Using Pyramid Debugtoolbar 4.5.