502 Error When Using Global Proxy

[imdoge]

I'm encountering a 502 Bad Gateway error when using httpx to make requests to my local server, but the same requests succeed when using the requests library. Below are the details of the commands I ran and the outputs I received:

import requests
import httpx
httpx.get("http://localhost:6333/collections")
<Response [502 Bad Gateway]>
httpx.get("https://www.google.com")
<Response [200 OK]>
httpx.get("http://httpbin.org/")
<Response [200 OK]>
requests.get("http://localhost:6333/collections")
<Response [200]>

Logs:
I enabled logging to further investigate the issue:

import logging
logging.basicConfig(level=logging.DEBUG)
httpx.get("http://localhost:6333/collections")
DEBUG:httpx:load_ssl_context verify=True cert=None trust_env=True http2=False
DEBUG:httpx:load_verify_locations cafile='C:\Users\Lin\anaconda3\lib\site-packages\certifi\cacert.pem'
DEBUG:httpx:load_ssl_context verify=True cert=None trust_env=True http2=False
DEBUG:httpx:load_verify_locations cafile='C:\Users\Lin\anaconda3\lib\site-packages\certifi\cacert.pem'
DEBUG:httpx:load_ssl_context verify=True cert=None trust_env=True http2=False
DEBUG:httpx:load_verify_locations cafile='C:\Users\Lin\anaconda3\lib\site-packages\certifi\cacert.pem'
DEBUG:httpcore.connection:connect_tcp.started host='127.0.0.1' port=233 local_address=None timeout=5.0 socket_options=None
DEBUG:httpcore.connection:connect_tcp.complete return_value=<httpcore._backends.sync.SyncStream object at 0x0000020FA7EFE4A0>
DEBUG:httpcore.http11:send_request_headers.started request=<Request [b'GET']>
DEBUG:httpcore.http11:send_request_headers.complete
DEBUG:httpcore.http11:send_request_body.started request=<Request [b'GET']>
DEBUG:httpcore.http11:send_request_body.complete
DEBUG:httpcore.http11:receive_response_headers.started request=<Request [b'GET']>
DEBUG:httpcore.http11:receive_response_headers.complete return_value=(b'HTTP/1.1', 502, b'Bad Gateway', [(b'Connection', b'close'), (b'Content-Length', b'0')])
INFO:httpx:HTTP Request: GET http://localhost:6333/collections "HTTP/1.1 502 Bad Gateway"
DEBUG:httpcore.http11:receive_response_body.started request=<Request [b'GET']>
DEBUG:httpcore.http11:receive_response_body.complete
DEBUG:httpcore.http11:response_closed.started
DEBUG:httpcore.http11:response_closed.complete

I noticed that the connection is to port 233. I'm using the Clash service mode to globally proxy my network traffic, which seems to be causing the 502 error. However, why do other httpx requests, as well as requests library calls, succeed?

httpx.get("https://www.google.com")
<Response [200 OK]>
httpx.get("http://httpbin.org/")
<Response [200 OK]>
requests.get("http://localhost:6333/collections")
<Response [200]>

Thanks~