使用Crawlera代理示例代码时遭遇407 Proxy Auth错误求助

Let's break down why you're hitting this 407 error and walk through actionable fixes that often resolve it—even when you’ve double-checked your initial config.

1. Verify API Key & Auth String Format #

• First, confirm your <APIKEY> is copied exactly, with no extra spaces, line breaks, or hidden formatting characters. Crawlera’s API keys are long, unbroken strings, so it’s easy to accidentally grab extra whitespace when copying from the dashboard. Try pasting it into a plain text editor first to strip any hidden formatting.
• Double-check the trailing colon in proxy_auth: your code uses "<APIKEY>:", which is correct, but make sure there’s no space between the key and the colon (e.g., don’t write <APIKEY> :). The colon tells Crawlera you’re using an empty password (which is required for their auth flow).

2. Fix Proxy URL Construction #

Your current proxy URL includes a trailing slash, which can sometimes cause parsing issues with requests. Try removing it:

proxies = {
    "https": "https://{}@{}:{}".format(proxy_auth, proxy_host, proxy_port),
    "http": "http://{}@{}:{}".format(proxy_auth, proxy_host, proxy_port)
}

Alternatively, use HTTPProxyAuth to separate credentials from the proxy URL—this avoids any string formatting edge cases:

import requests
from requests.auth import HTTPProxyAuth

url = "http://httpbin.org/ip"
proxy_host = "proxy.crawlera.com"
proxy_port = "8010"
proxy_auth = HTTPProxyAuth("<APIKEY>", "")  # Empty password is intentional

proxies = {
    "https": f"https://{proxy_host}:{proxy_port}",
    "http": f"http://{proxy_host}:{proxy_port}"
}

r = requests.get(url, proxies=proxies, auth=proxy_auth, verify=False)

3. Clear Conflicting Environment Variables #

If your system has global proxy environment variables set (HTTP_PROXY or HTTPS_PROXY), they might override your code’s explicit proxy config. Add these lines at the start of your script to eliminate that conflict:

import os
os.environ.pop('HTTP_PROXY', None)
os.environ.pop('HTTPS_PROXY', None)

4. Check Crawlera Account Status #

Even with correct code, a locked or inactive Crawlera account will trigger 407 errors:

• Log into your Crawlera dashboard to confirm your account is active (no overdue payments or restrictions).
• If you’ve enabled IP whitelisting, verify that the IP running your script is added to the allowed list. Whitelist misconfigurations often mimic auth failures.

Try these steps in order—most 407 errors with Crawlera boil down to a tiny formatting issue or overlooked account setting.

内容的提问来源于stack exchange，提问作者Joseph D.