使用Python Requests出现Response 401错误，更新Token仍报错的解决方法

Hey there, let's troubleshoot this 401 issue together—super frustrating when you've updated your token but it's still not working, right? Let's break down the most common fixes step by step:

This is the most frequent culprit. Sometimes we think we've updated the token, but the code is still pulling an old value:

• Did you hardcode the token earlier and forget to replace it? For example, if you had headers = {"Authorization": "Bearer old_123"}, make sure that old_123 is swapped for your new token.
• If you're loading the token from a config file or environment variable, confirm the file was saved properly or the env var was updated.
• Print out your request headers to verify:

  response = requests.get("your-api-url", headers=your_headers)
  print(response.request.headers)  # Look for the Authorization header here
  

  This will show you exactly what token is being sent to the API.

Most APIs expect the token to be prefixed with Bearer (note the space after it). Common mistakes here include:

• Forgetting the Bearer prefix entirely (e.g., just sending {"Authorization": "new_token"} instead of {"Authorization": "Bearer new_token"})
• Using lowercase bearer instead of uppercase Bearer (some strict APIs will reject this)
• Accidentally adding extra spaces or typos when copying the token (double-check the token string for missing/extra characters)

• Did your new token get issued with access to the specific endpoint you're calling? Some tokens are scoped to only certain resources (e.g., read-only access but you're trying to write data).
• Is the token expired? Short-lived tokens (like JWTs with tight expiration windows) might expire faster than you think. Try generating a brand new token and testing immediately.

If you're using a requests.Session() object, it might be retaining old headers from previous requests:

• Instead of creating a new session every time, update the session's headers explicitly:

  session = requests.Session()
  session.headers.update({"Authorization": "Bearer new_token"})
  response = session.get("your-api-url")
  

• If you're testing with tools like Postman or a browser, clear any cached credentials—sometimes old tokens stick around in session storage.

• Are you using the correct HTTP method? For example, if the API requires a POST request but you're sending a GET, some servers will return a 401 instead of a 405 (Method Not Allowed) error.
• Did you mix up environments? If your new token is for production but you're hitting a staging API endpoint (or vice versa), the token won't be recognized.

Try making a request with your new token using curl first—this will tell you if the issue is with your Python code or the token itself:

curl -H "Authorization: Bearer your-new-token" https://your-api-url/endpoint

If this works, the problem is in your Python Requests setup. If it fails, the token itself is invalid, expired, or lacks permissions.

内容的提问来源于stack exchange，提问作者J.Doe