error-code

variant error-code {
  DNS-timeout,
  DNS-error(DNS-error-payload),
  destination-not-found,
  destination-unavailable,
  destination-IP-prohibited,
  destination-IP-unroutable,
  connection-refused,
  connection-terminated,
  connection-timeout,
  connection-read-timeout,
  connection-write-timeout,
  connection-limit-reached,
  TLS-protocol-error,
  TLS-certificate-error,
  TLS-alert-received(TLS-alert-received-payload),
  HTTP-request-denied,
  HTTP-request-length-required,
  HTTP-request-body-size(option​<u64>),
  HTTP-request-method-invalid,
  HTTP-request-URI-invalid,
  HTTP-request-URI-too-long,
  HTTP-request-header-section-size(option​<u32>),
  HTTP-request-header-size(option​<field-size-payload>),
  HTTP-request-trailer-section-size(option​<u32>),
  HTTP-request-trailer-size(field-size-payload),
  HTTP-response-incomplete,
  HTTP-response-header-section-size(option​<u32>),
  HTTP-response-header-size(field-size-payload),
  HTTP-response-body-size(option​<u64>),
  HTTP-response-trailer-section-size(option​<u32>),
  HTTP-response-trailer-size(field-size-payload),
  HTTP-response-transfer-coding(option​<string>),
  HTTP-response-content-coding(option​<string>),
  HTTP-response-timeout,
  HTTP-upgrade-failed,
  HTTP-protocol-error,
  loop-detected,
  configuration-error,
  internal-error(option​<string>),
}