使用Python携带Access Token发送GET请求遇连接错误求助

Hey there, let's figure out why your Python script is hitting that connection timeout while Postman works perfectly. This almost always boils down to your Python request not matching what Postman sends—servers use all sorts of anti-scraping checks to block non-human traffic. Here's how to fix it step by step:

1. Copy Postman's Exact Request Headers #

Postman automatically adds a bunch of headers that your default Python requests call doesn't include. Servers often flag requests with generic or missing headers (like a blank User-Agent).

Quick fix: Use Postman's built-in code generator to get a Python script that mirrors your working request:

• In Postman, after sending the successful request, click the Code button (top-right corner)
• Select Python - requests from the dropdown
• Copy that code into your script—this will include all the headers, auth token, and any other parameters Postman used.

Example of what that might look like:

import requests

url = "https://your-target-api.com/endpoint"

headers = {
    'Authorization': 'Bearer YOUR_ACCESS_TOKEN',
    'User-Agent': 'PostmanRuntime/7.32.3',  # Match Postman's User-Agent exactly
    'Accept': '*/*',
    'Accept-Encoding': 'gzip, deflate, br',
    'Connection': 'keep-alive'
}

response = requests.get(url, headers=headers)
print(response.text)

Double-check that every header matches—especially User-Agent and Accept—these are common red flags for servers.

2. Replicate Postman's Session Context #

Postman might be storing cookies from previous requests that your Python script isn't using. Some servers require a valid session cookie to process requests, even with a valid access token.

Use requests.Session() to maintain cookies across requests, or manually add cookies from Postman:

import requests

session = requests.Session()
# Add headers from Postman
session.headers.update({
    'Authorization': 'Bearer YOUR_ACCESS_TOKEN',
    'User-Agent': 'PostmanRuntime/7.32.3'
})
# Add cookies from Postman (find them under Postman's "Cookies" tab)
session.cookies.set('session_id', 'abc123xyz')

response = session.get("https://your-target-api.com/endpoint")
print(response.text)

3. Check Proxy & Network Differences #

Sometimes Postman uses your system's proxy settings while Python doesn't, or vice versa. If your network has a proxy, add it to your Python request:

proxies = {
    'http': 'http://your-proxy-server:port',
    'https': 'https://your-proxy-server:port'
}

response = requests.get(url, headers=headers, proxies=proxies)

Another possibility: your IP might have been temporarily blocked by the server. Try switching to a different network (like a mobile hotspot) to test this.

4. Slow Down Your Requests #

Postman sends requests manually, so the frequency is low. If your Python script is sending requests in a loop quickly, the server might flag it as scraping. Add a delay between requests:

import time
import requests

headers = {
    # Your headers here
}

for _ in range(5):
    time.sleep(2)  # Wait 2 seconds between requests
    response = requests.get(url, headers=headers)
    print(response.text)

5. Verify TLS/SSL Compatibility #

Some servers require specific TLS versions that Postman handles automatically, but Python's requests might not. Try forcing a TLS 1.2 connection (common for older servers):

import ssl
import requests
from requests.adapters import HTTPAdapter
from urllib3.poolmanager import PoolManager
from urllib3.util import ssl_

class TLS12Adapter(HTTPAdapter):
    def init_poolmanager(self, *args, **kwargs):
        ssl_context = ssl_.create_urllib3_context(ssl.PROTOCOL_TLSv1_2)
        kwargs['ssl_context'] = ssl_context
        return super().init_poolmanager(*args, **kwargs)

session = requests.Session()
session.mount('https://', TLS12Adapter())
session.headers.update(headers)

response = session.get(url)
print(response.text)

Start with step 1 first—copying Postman's request directly will almost always fix this issue, since it proves the request parameters are valid. If that doesn't work, move through the other steps to narrow down the problem.

内容的提问来源于stack exchange，提问作者אברגיל יעקובו