Server Error (5xx)
HTTP 501 β 501 Not Implemented
The server either does not recognize the request method, or it lacks the ability to fulfill the request.
Common Causes & Diagnoses
- β’Unimplemented HTTP method or API stub endpoint in development.
Spesifikasyon & Kategori
Status Code:501
Category:Server Error (5xx)
RFC Standard:RFC 9110 / HTTP/1.1 & HTTP/2
Multi-Language Code Implementations
How to Handle, Return & Test HTTP 501
Status: 501 501 Not Implemented
server.js / handler.ts
// Express.js Server Response
app.get('/api/resource', (req, res) => {
// Returning 501 501 Not Implemented
return res.status(501).json({
error: '501 Not Implemented',
statusCode: 501,
timestamp: new Date().toISOString()
});
});
// Client-side fetch error check
const response = await fetch('/api/resource');
if (response.status === 501) {
console.warn('Received HTTP 501 501 Not Implemented');
}π‘ Pro Tip: Ensure appropriate error handling middleware or proxy interceptors are enabled so client applications receive structured JSON responses for HTTP 501.
How to Fix / Practical Code Solutions
Implement API Method
Provide handler or route for requested HTTP method.
Other Popular HTTP Status Codes
Frequently Asked Questions
Common Questions About HTTP 501 to RFC Standard
Everything you need to know regarding specifications, syntax, and security best practices.
The server either does not recognize the request method, or it lacks the ability to fulfill the request. In Turkish: Sunucu talep edilen metodu destekleyecek altyapΔ±ya henΓΌz sahip deΔil.