Scala调用Reddit API无法获取access token的技术咨询

Hey there, let's walk through exactly how to grab that access token now that you've got your authorization code sorted out. I totally get the confusion around the POST request requirement—let's break it down clearly:

Core Requirements for the Access Token Request #

First, forget about adding code or redirect_uri to the URL string. Reddit wants these sent in the body of a POST request, using application/x-www-form-urlencoded format (think standard form submission, not JSON). Here's what you need to include:

1. Request URL: https://www.reddit.com/api/v1/access_token
2. Basic Authentication: You need to authenticate your app using its client ID as the username and client secret as the password. This means encoding your_client_id:your_client_secret in Base64 and adding it to the request header like:

   Authorization: Basic <base64_encoded_string>
   

3. POST Body Parameters (all required):
   • grant_type: Set this to the fixed value authorization_code
   • code: The authorization code you already obtained
   • redirect_uri: Exactly the same URI you used when requesting the authorization code (even trailing slashes or case differences will cause errors!)

Example Using cURL #

To make this concrete, here's how you'd send the request with cURL (replace the placeholders with your actual values):

curl -X POST https://www.reddit.com/api/v1/access_token \
  -u "YOUR_CLIENT_ID:YOUR_CLIENT_SECRET" \
  -d "grant_type=authorization_code" \
  -d "code=YOUR_AUTHORIZATION_CODE" \
  -d "redirect_uri=YOUR_REDIRECT_URI"

Why No URL Parameters? #

Reddit enforces this for security reasons. Putting sensitive values like the authorization code in the URL can lead to them being logged in server logs, browser history, or proxy records. Sending them in the POST body keeps them more secure.

Common Pitfalls to Avoid #

• Double-check that your redirect_uri matches exactly what you used during the authorization step—this is the #1 cause of errors here.
• Don't send the body as JSON; Reddit expects form-encoded data.
• Make sure your app is set as a web app in your Reddit developer settings (since you're building a web application, not a script).

内容的提问来源于stack exchange，提问作者Abhi