Improve URL handling in JS Client

[hannahblair]

Description

This PR ensures that we correctly handle URLs in various formats. E.g. We weren't handling URLs with paths (to an extent) or URLs with trailing slashes. This also resulted in issues around fetching theme.css, /config and /info in some cases.

The following should now work (providing a gradio space is to be found at these URLs):

• hmb/hello-world
• http://localhost:7860
• http://localhost:7860/
• http://localhost:7860/app/gradio
• hmb-hello-world.hf.space
• hmb-hello-world.hf.space/

To test, run this python app and mount the gradio app on various paths:

import uvicorn
from fastapi import FastAPI

import gradio as gr


def predict(text):
    return text

with gr.Blocks() as block:
    text_in = gr.Textbox()
    text_out = gr.Textbox()
    btn = gr.Button("Predict")
    btn.click(predict, inputs=[text_in], outputs=[text_out], api_name="predict")

block.queue()
app = FastAPI()

gr.mount_gradio_app(app, block, path="")
# gr.mount_gradio_app(app, block, path="/")

if __name__ == "__main__":
    uvicorn.run(app, host="0.0.0.0", port=7860)

then in a separate app (or in serve an app as a static file with fastAPI), test you can connect to the app.

const app = await Client.connect("hmb/test-args");
const app = await Client.connect("http://0.0.0.0:7860/app/gradio");
const app = await Client.connect("http://0.0.0.0:7860/");
// etc 

You can also test that it fixes #4463 by testing embedding with the custom path:

import uvicorn
from fastapi import FastAPI

import gradio as gr

app = FastAPI()

@app.get('/app')
def hello():
    return {"message":"hello"}

g_app = gr.Interface(
    lambda x: f"Hello {x}",
    "textbox",
    "textbox",
)

app = gr.mount_gradio_app(app, g_app, path="/app/gradio")

uvicorn.run(app,host="0.0.0.0",port=8080)

<script type="module" src="http://localhost:4321/gradio.js"></script>

<gradio-app src="http://0.0.0.0:8080/app/gradio"></gradio-app>

Closes: #4469
Closes: #4463
Closes: #3472
Closes: #8154

🎯 PRs Should Target Issues

Before your create a PR, please check to see if there is an existing issue for this change. If not, please create an issue before you create this PR, unless the fix is very small.

Not adhering to this guideline will result in the PR being closed.

Tests

1. PRs will only be merged if tests pass on CI. To run the tests locally, please set up your Gradio environment locally and run the tests: bash scripts/run_all_tests.sh

2. You may need to run the linters: bash scripts/format_backend.sh and bash scripts/format_frontend.sh

[gradio-pr-bot]

🪼 branch checks and previews

•	Name	Status	URL
	Spaces	ready!	Spaces preview
	Website	ready!	Website preview
🦄	Changes	detected!	Details

---

Install Gradio from this PR

pip install https://gradio-builds.s3.amazonaws.com/f17855cf0d974ad4076ee8df3e8c3ce60eef0cee/gradio-4.31.5-py3-none-any.whl

Install Gradio Python Client from this PR

pip install "gradio-client @ git+https://github.com/gradio-app/gradio@f17855cf0d974ad4076ee8df3e8c3ce60eef0cee#subdirectory=client/python"

[gradio-pr-bot]

🦄 change detected

This Pull Request includes changes to the following packages.

Package	Version
@gradio/client	patch
gradio	patch

• Maintainers can select this checkbox to manually select packages to update.

With the following changelog entry.

Improve URL handling in JS Client

Maintainers or the PR author can modify the PR title to modify this entry.

Something isn't right?

• Maintainers can change the version label to modify the version bump.
• If the bot has failed to detect any changes, or if this pull request needs to update multiple packages to different versions or requires a more comprehensive changelog entry, maintainers can update the changelog file directly.

[aliabid94]

Code LGTM!

[pngwn]

One small comment, otherwise looks great.

[pngwn]

Looks great. Thanks @hannahblair!

[abidlabs]

Nice!

[autherous]

Thanks, Have been looking for this update.

Getting this error, when trying to install it
Unable to create package with no name

Is this the right way to install it

$ ./poetry add  https://gradio-builds.s3.amazonaws.com/f17855cf0d974ad4076ee8df3e8c3ce60eef0cee/gradio-4.31.5-py3-none-any.whl

Unable to create package with no name