React Native

Send a Staged Multipart REST Request

Demonstrates Rest.SendReqMultipart, which sends a multipart request using the parts configured on the object, then reads the response in separate steps.

Background. The staged request model separates sending from reading: a SendReq method transmits the request, ReadResponseHeader reads the status line and headers, and a ReadResp method reads the body. This gives fine control over large or streamed messages compared with the single-call full-request methods.

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React Native

import { Rest } from '@chilkat/react-native'

async function chilkatExample() {
  const rest = new Rest();
  const bTls = true;
  const bAutoReconnect = true;
  try {
    await rest.connectAsync('example.com', 443, bTls, bAutoReconnect);
  } catch {
    console.log(rest.lastErrorText);
    return;
  }

  // Configure one multipart part before sending.
  rest.partSelector = '1';
  rest.addHeader('Content-Type', 'text/plain');
  rest.addHeader('Content-Disposition', 'form-data; name="field1"');
  try {
    rest.setMultipartBodyString('value1');
  } catch {
    console.log(rest.lastErrorText);
    return;
  }

  // Send the multipart request using the configured parts.
  try {
    await rest.sendReqMultipartAsync('POST', '/api/upload');
  } catch {
    console.log(rest.lastErrorText);
    return;
  }

  // After sending, read the response status line and header fields.  The return value is the HTTP
  // status code, or -1 if no response was received.
  const statusCode = await rest.readResponseHeaderAsync();
  if (statusCode < 0) {
    console.log(rest.lastErrorText);
    return;
  }

  console.log(`Response status code: ${statusCode}`);

  // Read the response body as text.
  let responseBody: string;
  try {
    responseBody = await rest.readRespBodyStringAsync();
  } catch {
    console.log(rest.lastErrorText);
    return;
  }

  console.log(responseBody);
}