The client can set rc_api_server_response_t.http_status_code to RC_API_SERVER_RESPONSE_CLIENT_ERROR or RC_API_SERVER_RESPONSE_RETRYABLE_CLIENT_ERROR and then put the error message in rc_api_server_response_t.body.
RC_API_SERVER_RESPONSE_RETRYABLE_CLIENT_ERROR indicates a non-fatal error (such as timeout) that should be retried for critical messages like achievement unlocks.
More generic solution for #283
The client can set
rc_api_server_response_t.http_status_codetoRC_API_SERVER_RESPONSE_CLIENT_ERRORorRC_API_SERVER_RESPONSE_RETRYABLE_CLIENT_ERRORand then put the error message inrc_api_server_response_t.body.RC_API_SERVER_RESPONSE_RETRYABLE_CLIENT_ERRORindicates a non-fatal error (such as timeout) that should be retried for critical messages like achievement unlocks.