Fix for value stripping during WSGI path lookup

[grindsa]

as decribed in #313

When starting a WSGI Server with the Directory:url_prefix configured: If the url_prefix contains characters from the requested path, too much is stripped from the path and some URLs become unreachable.

https://docs.python.org/3/library/stdtypes.html#str.lstrip

"The chars argument is not a prefix; rather, all combinations of its values are stripped."

"/directory".lstrip("/devel-base")

The proposed removeprefix() fix is safe but does not work in python versions earlier than 3.9 (which might be the case when using Redhat8). This PR introduces a version-agnostic fix addressing the issue

[Copilot]

Pull request overview

This PR addresses incorrect path stripping in the WSGI app when Directory:url_prefix is configured (the str.lstrip() misuse described in #313), by introducing a version-agnostic prefix-removal helper and adding tests around WSGI path matching.

Changes:

• Add get_path_with_prefix() helper to normalize PATH_INFO and safely remove a configured url_prefix.
• Update application() to use get_path_with_prefix() instead of lstrip(prefix).
• Add new WSGI routing/path tests (and additionally add a large block of PKCS7-to-PEM related tests in test_helper.py).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 8 comments.

File	Description
examples/acme2certifier_wsgi.py	Adds get_path_with_prefix() and uses it in application() to avoid over-stripping paths.
test/test_wsgi_acme2certifier.py	Adds coverage for path normalization/prefix stripping and some WSGI routing behaviors.
test/test_helper.py	Adds multiple PKCS7-to-PEM tests (not described in the PR) plus additional helper-related tests.

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