html_url,issue_url,id,node_id,user,user_label,created_at,updated_at,author_association,body,reactions,issue,issue_label,performed_via_github_app
https://github.com/simonw/datasette/issues/838#issuecomment-795950636,https://api.github.com/repos/simonw/datasette/issues/838,795950636,MDEyOklzc3VlQ29tbWVudDc5NTk1MDYzNg==,79913,tsibley,2021-03-10T19:24:13Z,2021-03-10T19:24:13Z,NONE,"I think this could be solved by one of:

1. Stop generating absolute URLs, e.g. ones that include an origin. Relative URLs with absolute paths are fine, as long as they take `base_url` into account (as they do now, yay!).
2. Extend `base_url` to include the expected frontend origin, and then use that information when generating absolute URLs.
3. Document which HTTP headers the reverse proxy should set (e.g. the `X-Forwarded-*` family of conventional headers) to pass the frontend origin information to Datasette, and then use that information when generating absolute URLs.

Option 1 seems like the easiest to me, if you can get away with never having to generate an absolute URL.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",637395097,Incorrect URLs when served behind a proxy with base_url set,
https://github.com/simonw/datasette/issues/838#issuecomment-795939998,https://api.github.com/repos/simonw/datasette/issues/838,795939998,MDEyOklzc3VlQ29tbWVudDc5NTkzOTk5OA==,79913,tsibley,2021-03-10T19:16:55Z,2021-03-10T19:16:55Z,NONE,"Nod. The problem with the tests is that they're ignoring the origin (hostname, port) of links. In a reverse proxy situation, the frontend request origin is different than the backend request origin. The problem is Datasette generates links with the backend request origin.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",637395097,Incorrect URLs when served behind a proxy with base_url set,
https://github.com/simonw/datasette/issues/838#issuecomment-795893813,https://api.github.com/repos/simonw/datasette/issues/838,795893813,MDEyOklzc3VlQ29tbWVudDc5NTg5MzgxMw==,79913,tsibley,2021-03-10T18:43:39Z,2021-03-10T18:43:39Z,NONE,"@simonw Unfortunately this issue as I reported it is not actually solved in version 0.55.

Every link which is returned by the `Datasette.absolute_url` method is still wrong, because it uses the request URL as the base. This still includes the suggested facet links and pagination links.

What I wrote originally still stands:

> Although many of the URLs in the pages are correct (presumably because they either use absolute paths which include `base_url` or relative paths), the faceting and pagination links still use fully-qualified URLs pointing at `http://localhost:8001`.
> 
> I looked into this a little in the source code, and it seems to be an issue anywhere `request.url` or `request.path` is used, as these contain the values for the request between the frontend (Apache) and backend (Datasette) server. Those properties are primarily used via the `path_with_…` family of utility functions and the `Datasette.absolute_url` method.

 Would you prefer to re-open this issue or have me create a new one?
","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",637395097,Incorrect URLs when served behind a proxy with base_url set,
https://github.com/simonw/datasette/issues/838#issuecomment-643083451,https://api.github.com/repos/simonw/datasette/issues/838,643083451,MDEyOklzc3VlQ29tbWVudDY0MzA4MzQ1MQ==,79913,tsibley,2020-06-12T06:04:14Z,2020-06-12T06:04:14Z,NONE,"Hmm, I haven't tried removing `ProxyPassReverse`, but it doesn't touch the HTML, which is the issue I'm seeing. You can read the [documentation here](https://httpd.apache.org/docs/2.4/mod/mod_proxy.html#proxypassreverse). `ProxyPassReverse` is a standard directive when proxying with Apache. I've used it dozens of times with other applications.

Looking a little more at the code, I think the issue here is that the behaviour of `base_url` makes sense when Datasette is _mounted_ at a path within a larger application, but not when HTTP requests are being _proxied_ to it.

In a _mount_ situation, it is perfectly fine to construct URLs reusing the domain and path from the request. In a _proxy_ situation, it never is, as the domain and path in the request are not the domain and path that the non-proxy client actually needs to use. That is, links which include the Apache → Datasette request origin, `localhost:8001`, instead of the browser → Apache request origin, `example.com`, will be broken.

The tests you pointed to also reflect this in two ways:

1. They strip a leading `http://localhost`, allowing such URLs in the facet links to pass, but inclusion of that in a proxy situation would mean the URL is broken.

2. The test client emits direct ASGI events instead of actual proxied HTTP requests. The headers of these ASGI events don't reflect the way an HTTP proxy works; instead they pass through the original request path which contains `base_url`. This works because Datasette responds to requests equivalently at either `/…` or `/{base_url}/…`, which makes some sense in a _mount_ situation but is unconventional (albeit workable) for a proxied app.

Apps that support being proxied automatically support being mounted, but apps that only support being mounted don't automatically support being proxied.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",637395097,Incorrect URLs when served behind a proxy with base_url set,