can't use /en/ or /zh/ as path prefix with single version

[trim21]

Details

• Read the Docs project URL: https://readthedocs.org/projects/sci-hub-p2p/builds/
• Build URL (if applicable): https://readthedocs.org/projects/sci-hub-p2p/builds/14416637/
• Read the Docs username (if applicable): trim21

( I replace the en with _en in the latest build, but older build are broken)

Expected Result

URL like domain/en/introduction.html should works fine.

Actual Result

all URL like /en/introduction.html or /zh/introduction.html prefix get 404

but url /en/extra/index.md works fine.

[stsewd]

Thanks for reporting, this is a current limitation from our code that serves the documentation, since we try to map the URL to the correct version/translation/subproject instead of using the project information to map that URL to a correct file. I put some comments on an alternative implementation for our serve code that could fix this kind of problems #8327

[stsewd]

Our new implementation of the code that serves documentation doesn't have this problem, the new implementation is under a feature flag, but we won't be able to support this case till we make remove the old implementation, specifically this

readthedocs.org/readthedocs/proxito/urls.py

Lines 163 to 171 in eadf6ac

	re_path(
	(
	r'^(?:projects/(?P<subproject_slug>{project_slug})/)?'
	r'(?P<lang_slug>{lang_slug})/'
	r'(?P<version_slug>{version_slug})$'.format(**pattern_opts)
	),
	fast_404,
	name='docs_detail_directory_indexing',
	),