HTTP 202 Accepted vs 502 Bad Gateway
HTTP 202 (Accepted) is a 2xx Success response, while 502 (Bad Gateway) is a 5xx Server Error response. 202 indicates that the request has been accepted for processing, but the processing has not been completed. The request might or might not eventually be acted upon. In contrast, 502 means that the server, acting as a gateway or proxy, received an invalid response from the upstream server.
คำอธิบาย
The request has been accepted for processing, but the processing has not been completed. The request might or might not eventually be acted upon.
เมื่อคุณพบเห็น
For async operations like batch jobs, email sending, or background tasks that take time to complete.
วิธีแก้ไข
Poll the provided status URL or wait for a callback/webhook.
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
202 is a 2xx Success response, while 502 is a 5xx Server Error response.
HTTP 202: The request has been accepted for processing, but the processing has not been completed. The request might or might not eventually be acted upon.
HTTP 502: The server, acting as a gateway or proxy, received an invalid response from the upstream server.
You encounter 202 when for async operations like batch jobs, email sending, or background tasks that take time to complete.
You encounter 502 when when Nginx/Apache can't reach the application server (e.g., Gunicorn is down, upstream timeout).
ควรใช้อันไหนเมื่อไร
For 202 (Accepted): Poll the provided status URL or wait for a callback/webhook. For 502 (Bad Gateway): Check if the upstream server is running. Verify proxy configuration. Check for upstream timeouts.