React Native

Set a Multipart Part Body from a StringBuilder

Demonstrates Rest.SetMultipartBodySb, which sets the text body of the selected multipart part from a StringBuilder.

Background. A multipart request is assembled part by part: the part selector chooses the part being built, header fields describe it, and a SetMultipartBody method supplies its content. The request is then sent with a multipart send or full-request method.

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React Native

import { Rest, StringBuilder } 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;
  }

  // Select the multipart part to build, and set its header fields.
  rest.partSelector = '1';
  rest.addHeader('Content-Disposition', 'form-data; name="field1"');
  rest.addHeader('Content-Type', 'application/json');

  // Set the text body of the selected part from a StringBuilder.
  const sbBody = new StringBuilder();
  sbBody.append('{ "key": "value" }');
  try {
    rest.setMultipartBodySb(sbBody);
  } catch {
    console.log(rest.lastErrorText);
    return;
  }

  let responseText: string;
  try {
    responseText = await rest.fullRequestMultipartAsync('POST', '/api/upload');
  } catch {
    console.log(rest.lastErrorText);
    return;
  }

  console.log(responseText);
}