How to send http request through specific network interface?

[ChrisYP]

I have two network interfaces and both with internet access. Let's say my interfaces are eth0 and ETH999. I need specific requests to go through ETH999 interface and eth0 is the default interface in my server.
I can do this with these codes when I use requests.

import socket
import requests
from requests import adapters
from urllib3.poolmanager import PoolManager
class InterfaceAdapter(adapters.HTTPAdapter):
def __init__(self, **kwargs):
self.iface = kwargs.pop('iface', None)
super(InterfaceAdapter, self).__init__(**kwargs)
def _socket_options(self):
if self.iface is None:
return []
else:
return [(socket.SOL_SOCKET, socket.SO_BINDTODEVICE, self.iface)]
def init_poolmanager(self, connections, maxsize, block=False):
self.poolmanager = PoolManager(
num_pools=connections,
maxsize=maxsize,
block=block,
socket_options=self._socket_options()
)
session = requests.Session()
for prefix in ('http://', 'https://'):
# set ETH999 interface here
session.mount(prefix, InterfaceAdapter(iface=ETH999'))
print(session.get("https://ifconfig.me/").text

so how to do the same on Httpx? thanks.

[lovelydinosaur]

Hi there. Is this what you're looking for?...

https://www.python-httpx.org/advanced/#custom-transports

For some advanced configuration you might need to instantiate a transport class directly, and pass it to the client instance. One example is the local_address configuration which is only available via this low-level API.

>>>importhttpx>>>transport=httpx.HTTPTransport(local_address="0.0.0.0")
>>>client=httpx.Client(transport=transport)

[ChrisYP]

This doesn't work for me. I have two real physical network cards instead of one card with two IP addresses. I need to specify the second network card for network requests. With your settings, I can only get timeout request errors.

[lovelydinosaur]

Oh okay, looking at this more carefully now, you need to set the socket options, not the local address, right?

What does your # set ETH999 interface here code look like?

[ChrisYP]

import socket
import requests
from requests_toolbelt.adapters.socket_options import SocketOptionsAdapter
session = requests.Session()
# set interface here -> ETH999 is my interface's name.
options = [(socket.SOL_SOCKET, socket.SO_BINDTODEVICE, b"ETH999")]
for prefix in ('http://', 'https://'):
session.mount(prefix, SocketOptionsAdapter(socket_options=options))
print(session.get("https://httpbin.org/ip").text)

The above code is work very well for me. Thank you.

[lovelydinosaur]

I've opened an issue for this here... encode/httpcore#662

[lovelydinosaur]

The httpcore package version 0.17.2 now supports this, and I've opened https://github.com/encode/httpx/issues/2715 to add it to httpx.

[karpetrosyan]

Since #2716 has been merged, hopefully this api will provide the answer to your question beginning with version 0.24.2.

>>>importhttpx>>>socket_options= [(socket.SOL_SOCKET, socket.SO_BINDTODEVICE, b"ETH999")]
>>>transport=httpx.HTTPTransport(socket_options=socket_options)
>>>client=httpx.Client(transport=transport)