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The HTTP Status Codes and the corresponding error codes from the error responses are given below.
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Transport error codes
Error Code | Detail |
101000 | Receiver input/output error sending |
101001 | Receiver input/output error receiving |
101500 | Sender input/output error sending |
101501 | Sender input/output error receiving |
101503 | Connection failed |
101504 | Connection timed out (no input was detected on this connection over the maximum period of inactivity) |
101505 | Connection closed |
101506 | NHTTP protocol violation |
101507 | Connection canceled |
101508 | Request to establish new connection timed out |
101509 | Send abort |
101510 | Response processing failed |
If the HTTP PassThrough transport is used, and a connection-level error occurs, the error code is calculated using the following equation:
Error code = Base error code + Protocol State |
There is a a machine state machine in the transport sender side, where the protocol state changes according to the phase of the message.
Following are the possible protocol states and the description for each:
Protocol State | Description |
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Protocol State | Description |
REQUEST_READY (0) | Connection is at the initial stage ready to send a request |
REQUEST_HEAD(1) | Sending the request headers through the connection |
REQUEST_BODY(2) | Sending the request body |
REQUEST_DONE(3) | Request is completely sent |
RESPONSE_HEAD(4) | The connection is reading the response headers |
RESPONSE_BODY(5) | The connection is reading the response body |
RESPONSE_DONE(6) | The response is completed |
CLOSING(7) | The connection is closing |
CLOSED(8) | The connection is closed |
Since there are several possible protocol states in which a request can time out, you can calculate the error code accordingly using the values in the table above. For example, in a scenario where you send a request and the request is completely sent to the backend, but a timeout happens before the response headers are received, the error code is calculated as follows:
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