Function resolveFieldComponent

http/unstable_message_signatures.ts:500–523

(
  name: string,
  message: Request | Response,
  params: ComponentParameters,
)

}

function resolveFieldComponent(
  name: string,
  message: Request | Response,
  params: ComponentParameters,
): string {
  const headerValue = message.headers.get(name);
  if (headerValue === null) {
    throw new TypeError(`Missing "${name}" header field`);
  }

  if (params.sf) {
    return resolveStrictStructuredField(headerValue, name);
  }

  if (params.key !== undefined) {
    return resolveDictionaryMember(headerValue, name, params.key);
  }

  if (params.bs) {
    return resolveBinaryWrapped(headerValue);
  }

  return headerValue;
}

function resolveStrictStructuredField(
  headerValue: string,