200 OK
The request has succeeded. The meaning of a success varies depending on the HTTP method.
Usually happens because:
- ☑ Successful GET request fetching web
- ☑ Successful POST, PUT, or DELETE
🔍 Quick Checklist:
Meaning
The HTTP 200 OK status code indicates that the request has succeeded. A 200 response is cacheable by default. The payload sent in a 200 response depends on the request method (e.g., resource representation for GET, action results for POST).
Root Causes
- Successful GET request fetching web pages, images, or JSON data.
- Successful POST, PUT, or DELETE request completing operations on the server.
| Cause | Frequency |
|---|---|
| Successful GET request fetching web | ⭐⭐⭐⭐⭐ |
| Successful POST, PUT, or DELETE | ⭐⭐⭐⭐ |
Common Mistakes
- Returning HTTP 200 OK but embedding error messages (e.g. { error: 'Database failed' }) in the payload body (Soft 200).
- Failing to set cache-control headers, resulting in stale cached responses.
How to Fix
Framework-Specific Examples
Returning 200 OK with JSON response payload in Express.
app.get('/api/data', (req, res) => {
res.status(200).json({ success: true, payload: [] });
});Server Configuration Examples
Configuring standard file serving resulting in 200 OK status codes.
location / {
try_files $uri $uri/ =404;
}Prevention
- Strictly map HTTP status codes to actual backend results (e.g., return 500 for backend crash instead of 200).
- Use robust validation middleware before executing request logic.
Frequently Asked Questions (FAQ)
Q: What is a 'Soft 200' error?
A Soft 200 happens when a page returns a 200 OK status code, but the page content is actually an error message (like a 404 or server crash). This confuses search crawlers and client fetch wrappers.
Q: Are 200 OK responses cached by default?
Yes, GET requests resulting in a 200 OK are cached unless explicit cache-control headers (like Cache-Control: no-store) are returned by the server.
Q: Can POST requests return 200 OK?
Yes. If a POST request processes an action and returns the output payload directly, 200 OK is the standard response code.
Q: How does 200 OK differ from 304 Not Modified?
A 200 OK returns the full response payload body, whereas 304 Not Modified tells the browser that the cached local version is still valid, skipping body data downloads.