Forward query string when redirecting from /git-pull/ endpoint

[frankier]

Fixes: #290

I've been having trouble with the redirect on BinderHub when 3rd party cookies are disabled. This fowards the token query string argument which seems to fix the issue.

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[consideRatio]

I'd like to review and help this PR, but I'm not confident on the situation you look to resolve based on the PR description.

Can you describe example links where nbgitpullers behavior will changed with this PR?

[frankier]

In Chrome/Chromium you should encounter this on BinderHub, when you disable 3rd party cookies. Do you happen to have a spare BinderHub nbgitpuller link handy?

[frankier]

Old / does not work with 3rd party cookies disabled:

https://mybinder.org/v2/gh/frankier/duckbook/oldnbgitpuller?urlpath=git-pull%3Frepo%3Dhttps%253A%252F%252Fgithub.com%252Ffrankier%252Fcran_licenses%26branch%3Dmain

New / based on this PR

https://mybinder.org/v2/gh/frankier/duckbook/main?urlpath=git-pull%3Frepo%3Dhttps%253A%252F%252Fgithub.com%252Ffrankier%252Fcran_licenses%26branch%3Dmain

[manics]

Would you say this is primarily a mybinder.org issue that could affect other applications/extensions?

Can you open your browser debug/log console, and show us all the network requests and logs for a failing redirect?

[frankier]

I'm having some trouble generating working example links here because the link generator is still broken for me.

For me, the link generator is still not working. See also: #297

[frankier]

As requested...

The above links are finally fixed now. It might be enough to use an incognito window for testing. For me, one works and one does not.

P.S.: Click them while they're warm(!) ;)

P.P.S: I think this might affect other BinderHub instances? I'm not sure about other cases.

[frankier]

Hi! Were either of you able to replicate from my description?

[frankier]

I've resolved conflicts now. Please let me know if anything is unclear with this PR.

[manics]

I still can't reproduce the error reported in #290

https://mybinder.org/v2/gist/manics/7e82eefd3a72c3480af8752f5978490c/master?urlpath=git-pull%3Frepo%3Dhttps%253A%252F%252Fgithub.com%252Foctocat%252FHello-World%26urlpath%3Dtree%252FHello-World%252F%26branch%3Dmaster
Works fine for me with the current release of nbgitpuller, in Google Chrome Incognito:

• Environment: https://gist.github.com/manics/7e82eefd3a72c3480af8752f5978490c
• Content: https://github.com/octocat/Hello-World

[frankier]

Well I'm not working on this anymore so I can't say exactly what went wrong. No problem if it works for you and you don't want to pass the token query string through redirects along and rely on the cookie. Maybe someone will be able to post a replicable bug later on.