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  • absolute_url() behind a proxy assembles incorrect http://127.0.0.1:8001/ URLs · 8 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions issue performed_via_github_app
873166836 https://github.com/simonw/datasette/issues/1387#issuecomment-873166836 https://api.github.com/repos/simonw/datasette/issues/1387 MDEyOklzc3VlQ29tbWVudDg3MzE2NjgzNg== rayvoelker 9308268 2021-07-02T17:58:23Z 2021-07-02T17:58:23Z NONE

Thanks Simon for nailing that one down! It does seem a little confusing that the ProxyPreservehost option is set to Off By default, but this config totally did the trick and fixed the issue

<Location /collection-analysis/> ProxyPass http://127.0.0.1:8010/collection-analysis/ ProxyPreservehost On </Location>

 
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 absolute_url() behind a proxy assembles incorrect http://127.0.0.1:8001/ URLs 935930820  
873156408 https://github.com/simonw/datasette/issues/1387#issuecomment-873156408 https://api.github.com/repos/simonw/datasette/issues/1387 MDEyOklzc3VlQ29tbWVudDg3MzE1NjQwOA== simonw 9599 2021-07-02T17:37:30Z 2021-07-02T17:37:30Z OWNER 
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 absolute_url() behind a proxy assembles incorrect http://127.0.0.1:8001/ URLs 935930820  
873141222 https://github.com/simonw/datasette/issues/1387#issuecomment-873141222 https://api.github.com/repos/simonw/datasette/issues/1387 MDEyOklzc3VlQ29tbWVudDg3MzE0MTIyMg== simonw 9599 2021-07-02T17:09:32Z 2021-07-02T17:09:32Z OWNER

I'm going to add this to the suggested Apache configuration at https://docs.datasette.io/en/stable/deploying.html#apache-proxy-configuration

 
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 absolute_url() behind a proxy assembles incorrect http://127.0.0.1:8001/ URLs 935930820  
873140742 https://github.com/simonw/datasette/issues/1387#issuecomment-873140742 https://api.github.com/repos/simonw/datasette/issues/1387 MDEyOklzc3VlQ29tbWVudDg3MzE0MDc0Mg== simonw 9599 2021-07-02T17:08:40Z 2021-07-02T17:08:40Z OWNER

ProxyPreserveHost On is the Apache setting - it defaults to Off: https://httpd.apache.org/docs/2.4/mod/mod_proxy.html#proxypreservehost 

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 absolute_url() behind a proxy assembles incorrect http://127.0.0.1:8001/ URLs 935930820  
873139138 https://github.com/simonw/datasette/issues/1387#issuecomment-873139138 https://api.github.com/repos/simonw/datasette/issues/1387 MDEyOklzc3VlQ29tbWVudDg3MzEzOTEzOA== simonw 9599 2021-07-02T17:05:47Z 2021-07-02T17:05:47Z OWNER

In this case the proxy is Apache. So there are a couple of potential fixes:

  • Configure Apache to pass the original HTTP request Host: header through to the proxied application. This should then be documented.
  • Add a new optional feature to Datasette called something like base_host which, if set, is always used in place of the host in request.url when constructing new URLs.
 
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 absolute_url() behind a proxy assembles incorrect http://127.0.0.1:8001/ URLs 935930820  
873137935 https://github.com/simonw/datasette/issues/1387#issuecomment-873137935 https://api.github.com/repos/simonw/datasette/issues/1387 MDEyOklzc3VlQ29tbWVudDg3MzEzNzkzNQ== simonw 9599 2021-07-02T17:03:36Z 2021-07-02T17:03:36Z OWNER

And the links to apply a facet value are broken too! https://ilsweb.cincinnatilibrary.org/collection-analysis/current_collection-3d4a4b7/bib?_facet=bib_level_callnumber

json { "value": "g l fiction", "label": "g l fiction", "count": 212, "toggle_url": "https://127.0.0.1:8010/collection-analysis/current_collection-3d4a4b7/bib.json?_facet=bib_level_callnumber&bib_level_callnumber=g+l+fiction", "selected": false } Same problem: https://github.com/simonw/datasette/blob/ea627baccf980d7d8ebc9e1ffff1fe34d556e56f/datasette/facets.py#L251-L261

 
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 absolute_url() behind a proxy assembles incorrect http://127.0.0.1:8001/ URLs 935930820  
873136440 https://github.com/simonw/datasette/issues/1387#issuecomment-873136440 https://api.github.com/repos/simonw/datasette/issues/1387 MDEyOklzc3VlQ29tbWVudDg3MzEzNjQ0MA== simonw 9599 2021-07-02T17:01:48Z 2021-07-02T17:01:48Z OWNER

Here's what's happening: https://github.com/simonw/datasette/blob/d23a2671386187f61872b9f6b58e0f80ac61f8fe/datasette/views/table.py#L827-L829

This is being run through absolute_url() - defined here: https://github.com/simonw/datasette/blob/d23a2671386187f61872b9f6b58e0f80ac61f8fe/datasette/app.py#L633-L637

That's because the next_url in the JSON needs to be a full URL that a client can retrieve - as opposed to the other links on that page which are all relative links that start with /: https://github.com/simonw/datasette/blob/ea627baccf980d7d8ebc9e1ffff1fe34d556e56f/datasette/templates/_table.html#L11-L15

 
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 absolute_url() behind a proxy assembles incorrect http://127.0.0.1:8001/ URLs 935930820  
873134866 https://github.com/simonw/datasette/issues/1387#issuecomment-873134866 https://api.github.com/repos/simonw/datasette/issues/1387 MDEyOklzc3VlQ29tbWVudDg3MzEzNDg2Ng== simonw 9599 2021-07-02T16:58:52Z 2021-07-02T16:58:52Z OWNER

What's weird here is that the URL itself is correct - it starts with /collection-analysis/ as expected - but the hostname is wrong.

 
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 absolute_url() behind a proxy assembles incorrect http://127.0.0.1:8001/ URLs 935930820  

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