html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,issue,performed_via_github_app
https://github.com/simonw/datasette/issues/1590#issuecomment-1012661522,https://api.github.com/repos/simonw/datasette/issues/1590,1012661522,IC_kwDOBm6k_c48W_0S,9599,2022-01-14T01:16:08Z,2022-01-14T01:16:34Z,OWNER,"OK, I'm going to recommend a workaround for this instead. Here's `asgi.py` updated to strip the prefix before passing the request on to Datasette:
```python
import pathlib
from asgi_cors import asgi_cors
from channels.routing import URLRouter
from django.urls import re_path
from datasette.app import Datasette


def rewrite_path(app, prefix_to_strip):
    async def rewrite_path_app(scope, receive, send):
        if (
            scope[""type""] == ""http""
            and ""path"" in scope
            and scope[""path""].startswith(prefix_to_strip)
        ):
            scope[""path""] = scope[""path""][len(prefix_to_strip) :]
            if ""raw_path"" in scope:
                scope[""raw_path""] = scope[""raw_path""][len(prefix_to_strip) :]
        await app(scope, receive, send)

    return rewrite_path_app


datasette_ = Datasette(
    files=[""fixtures.db""],
    settings={""base_url"": ""/datasettes/"", ""plugins"": {}},
)
application = URLRouter(
    [
        re_path(
            r""^datasettes/.*"",
            asgi_cors(rewrite_path(datasette_.app(), ""/datasettes""), allow_all=True),
        ),
    ]
)
```
This works on my laptop - please re-open the ticket if it doesn't work for you!","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",1099723916,
https://github.com/simonw/datasette/issues/1590#issuecomment-1012656790,https://api.github.com/repos/simonw/datasette/issues/1590,1012656790,IC_kwDOBm6k_c48W-qW,9599,2022-01-14T01:05:34Z,2022-01-14T01:05:34Z,OWNER,"I think this prefixed string mechanism is supposed to prevent the `base_url` prefix from being applied twice: https://github.com/simonw/datasette/blob/3664ddd400062123e99500d28b160c7944408c1a/datasette/url_builder.py#L9-L16

But with a bit of extra logging all of the inputs to that are NOT prefixed strings:

```
Urls.path called with: /datasettes/fixtures/compound_three_primary_keys?_sort=content (PrefixedUrlString = False)
  returning /datasettes/datasettes/fixtures/compound_three_primary_keys?_sort=content
```
So it looks like `urls.path(...)` is indeed the code responsible for doubling up that `/datasettes/` prefix.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",1099723916,
https://github.com/simonw/datasette/issues/1590#issuecomment-1012653966,https://api.github.com/repos/simonw/datasette/issues/1590,1012653966,IC_kwDOBm6k_c48W9-O,9599,2022-01-14T00:59:07Z,2022-01-14T00:59:07Z,OWNER,"Since this is a special case bug for when using Datasette as a library I wonder if a good fix here would be to support something like this:
```python
application = URLRouter([
  re_path(r""^datasettes/.*"", asgi_cors(datasette_.app(remove_path_prefix=""datasettes/""), allow_all=True)),
])
```","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",1099723916,