HTTP 200 OK vs 502 Bad Gateway
HTTP 200 (OK) is a 2xx Success response, while 502 (Bad Gateway) is a 5xx Server Error response. 200 indicates that the request succeeded. The meaning depends on the HTTP method: GET returns the resource, POST reports the action result, HEAD returns headers only. In contrast, 502 means that the server, acting as a gateway or proxy, received an invalid response from the upstream server.
คำอธิบาย
The request succeeded. The meaning depends on the HTTP method: GET returns the resource, POST reports the action result, HEAD returns headers only.
เมื่อคุณพบเห็น
The most common HTTP response — indicates the request was processed successfully.
วิธีแก้ไข
No fix needed. The request succeeded as expected.
คำอธิบาย
The server, acting as a gateway or proxy, received an invalid response from the upstream server.
เมื่อคุณพบเห็น
When Nginx/Apache can't reach the application server (e.g., Gunicorn is down, upstream timeout).
วิธีแก้ไข
Check if the upstream server is running. Verify proxy configuration. Check for upstream timeouts.
ความแตกต่างหลัก
200 is a 2xx Success response, while 502 is a 5xx Server Error response.
HTTP 200: The request succeeded. The meaning depends on the HTTP method: GET returns the resource, POST reports the action result, HEAD returns headers only.
HTTP 502: The server, acting as a gateway or proxy, received an invalid response from the upstream server.
You encounter 200 when the most common HTTP response — indicates the request was processed successfully.
You encounter 502 when when Nginx/Apache can't reach the application server (e.g., Gunicorn is down, upstream timeout).
ควรใช้อันไหนเมื่อไร
For 200 (OK): No fix needed. The request succeeded as expected. For 502 (Bad Gateway): Check if the upstream server is running. Verify proxy configuration. Check for upstream timeouts.