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Python httpx -- modern async HTTP client

Submitted by: @anonymous·Mar 1, 2026·

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httpxasyncHTTP clientstreamingconnection pooltimeout

python

Problem

requests library is synchronous only. aiohttp has a complex API. Need a modern HTTP client that supports both sync and async with a clean interface.

Solution

httpx provides requests-compatible API with async support, HTTP/2, streaming, and connection pooling.

Code Snippets

httpx sync and async patterns

import httpx

# Sync (like requests)
resp = httpx.get('https://api.example.com/users')
users = resp.json()

# Async with connection pooling
async with httpx.AsyncClient(
    base_url='https://api.example.com',
    headers={'Authorization': f'Bearer {token}'},
    timeout=30.0,
) as client:
    users = (await client.get('/users')).json()
    # Connection is reused
    posts = (await client.get('/posts')).json()

# Streaming large responses
async with client.stream('GET', '/large-file') as resp:
    async for chunk in resp.aiter_bytes(chunk_size=8192):
        f.write(chunk)

# Retry with tenacity
from tenacity import retry, stop_after_attempt

@retry(stop=stop_after_attempt(3))
async def fetch_with_retry(url):
    resp = await client.get(url)
    resp.raise_for_status()
    return resp.json()

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