Add an explicit dependency of urllib3~=2.0 and update processing_utils.save_url_to_cache to use urllib3 for Lite support (#8011)

* Add an explicit dependency of `urllib3` and update `processing_utils.save_url_to_cache` to use `urllib3` for Lite support

* add changeset

* Update requirements.txt

Co-authored-by: Abubakar Abid <abubakar@huggingface.co>

* add changeset

* update test requirements

* update test reqs

* add changeset

---------

Co-authored-by: gradio-pr-bot <gradio-pr-bot@users.noreply.github.com>
Co-authored-by: Abubakar Abid <abubakar@huggingface.co>

.changeset/nine-melons-follow.md

@@ -0,0 +1,5 @@
+---
+"gradio": minor
+---
+
+fix:Add an explicit dependency of `urllib3~=2.0` and update `processing_utils.save_url_to_cache` to use `urllib3` for Lite support

gradio/processing_utils.py

@@ -16,6 +16,7 @@ from typing import TYPE_CHECKING, Any
 import aiofiles
 import httpx
 import numpy as np
+import urllib3
 from gradio_client import utils as client_utils
 from PIL import Image, ImageOps, PngImagePlugin
 
@@ -208,10 +209,15 @@ def save_url_to_cache(url: str, cache_dir: str) -> str:
     full_temp_file_path = str(abspath(temp_dir / name))
 
     if not Path(full_temp_file_path).exists():
-        with httpx.stream("GET", url, follow_redirects=True) as r, open(
-            full_temp_file_path, "wb"
-        ) as f:
-            for chunk in r.iter_raw():
+        # NOTE: We use urllib3 instead of httpx because it works in the Wasm environment. See https://github.com/gradio-app/gradio/issues/6837.
+        http = urllib3.PoolManager()
+        response = http.request(
+            "GET",
+            url,
+            preload_content=False,
+        )
+        with open(full_temp_file_path, "wb") as f:
+            for chunk in response.stream():
                 f.write(chunk)
 
     return full_temp_file_path

requirements.txt

@@ -20,6 +20,7 @@ pydub
 pyyaml>=5.0,<7.0
 semantic_version~=2.0
 typing_extensions~=4.0
+urllib3~=2.0  # urllib3 is used for Lite support. Version spec can be omitted because urllib3==2.1.0 is prebuilt for Pyodide and urllib>=2.2.0 supports Pyodide as well.
 uvicorn>=0.14.0; sys.platform != 'emscripten'
 typer[all]>=0.9,<1.0; sys.platform != 'emscripten'
 tomlkit==0.12.0

test/requirements.txt

@@ -26,9 +26,9 @@ attrs==21.4.0
     #   pytest
 backcall==0.2.0
     # via ipython
-boto3==1.26.65
+boto3==1.34.84
     # via -r requirements.in
-botocore==1.29.87
+botocore==1.34.84
     # via
     #   boto3
     #   s3transfer
@@ -273,7 +273,7 @@ ruff==0.2.2
     # via
     #   -r requirements.in
     #   gradio
-s3transfer==0.6.0
+s3transfer==0.10.0
     # via boto3
 safetensors==0.4.2
     # via