203 Non-Authoritative Information

203

Non-Authoritative Information

✨

Example HTTP Response

HTTP Response

HTTP/1.1 203 Non-Authoritative Information
Content-Type: application/json

{"data": "modified by proxy"}

Common Causes

Response modified by a proxy or cache
Metadata from local or third-party copy
Mirror or CDN serving transformed content

Technical Details

What does this mean?

It's like getting news through a friend of a friend. The info is good, but it might have been paraphrased along the way!

Technical Definition

The request was successful but the enclosed payload has been modified by a transforming proxy from the origin server's 200 OK response.

RFC Says

"The 203 (Non-Authoritative Information) status code indicates that the request was successful but the enclosed payload has been modified from that of the origin server's 200 (OK) response by a transforming proxy."

Plain English:

The request was successful, but the response was modified by a proxy or intermediary. This is like receiving information that's been filtered or transformed - it's still valid, just not the original.

View RFC Documentation

Code Snippets

Ready-to-use code for returning this HTTP status in your application:

Node.js

// Express.js
app.get('/example', (req, res) => {
  res.status(203).json({
    error: 'Non-Authoritative Information',
    message: 'Your error message here'
  });
});

// Native HTTP
const http = require('http');

http.createServer((req, res) => {
  res.writeHead(203, { 'Content-Type': 'application/json' });
  res.end(JSON.stringify({
    error: 'Non-Authoritative Information',
    message: 'Your error message here'
  }));
}).listen(3000);

203 Non-Authoritative Information FAQ

What causes a 203 Non-Authoritative Information error?

Response modified by a proxy or cache. Metadata from local or third-party copy. Mirror or CDN serving transformed content.

// Express.js app.get('/example', (req, res) => { res.status(203).json({ error: 'Non-Authoritative Information', message: 'Your error message here' }); }); // Native HTTP const http = require('http'); http.createServer((req, res) => { res.writeHead(203, { 'Content-Type': 'application/json' }); res.end(JSON.stringify({ error: 'Non-Authoritative Information', message: 'Your error message here' })); }).listen(3000);