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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 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 |
|---|---|
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:
In this scenario, the base error code is CONNECTION_TIMEOUT(101504) and the protocol state is REQUEST_DONE(3).
Therefore,
Error code = 101504 + 3 = 101507
These Transport error codes are used in Advanced Configurations of Endpoints.
Custom error messages
To send a custom message with a custom HTTP status code, you execute an additional sequence that can generate a new error message. You then override the message body, HTTP status code and other values.
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