React Native

Explaining the Rest ClearResponseBodyStream Method

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The ClearResponseBodyStream method would be needed if your applicaiton called SetResponseBodyStream to send the response to a stream for one request, but then wants to subsequently do something else. The application must call ClearResponseBodyStream to no longer send responses to the stream. React Native

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

async function chilkatExample() {
  let success = false;

  // This example requires the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  const rest = new Rest();

  // Connect to the web server
  const bTls = true;
  const port = 443;
  const bAutoReconnect = true;
  try {
    await rest.connectAsync('www.chilkatsoft.com', port, bTls, bAutoReconnect);
  } catch {
    console.log(rest.lastErrorText);
    return;
  }

  // Setup a file stream for the download
  const fileStream = new Stream();
  fileStream.sinkFile = 'qa_output/starfish.jpg';

  // Indicate that the call to FullRequestNoBody should send the response body
  // to fileStream if the response status code is 200.
  // If a non-success response status code is received, then nothing
  // is streamed to the output file and the error response is returned by FullRequestNoBody.
  const expectedStatus = 200;
  rest.setResponseBodyStream(expectedStatus, true, fileStream);

  let responseStr = '';
  try {
    responseStr = await rest.fullRequestNoBodyAsync('GET', '/images/starfish.jpg');
  } catch {
    // Examine the request/response to see what happened.
    console.log(`response status code = ${rest.responseStatusCode}`);
    console.log(`response status text = ${rest.responseStatusText}`);
    console.log(`response header: ${rest.responseHeader}`);
    console.log(`response body (if any): ${responseStr}`);
    console.log('---');
    console.log(`LastRequestStartLine: ${rest.lastRequestStartLine}`);
    console.log(`LastRequestHeader: ${rest.lastRequestHeader}`);
    return;
  }

  console.log('downloaded starfish.jpg');

  // Clear the response body stream previously set in the call to SetResponseBodyStream.
  rest.clearResponseBodyStream();

  // Download something else, but this time send the response body to bd.
  const bd = new BinData();
  try {
    await rest.fullRequestNoBodyBdAsync('GET', '/images/penguins.jpg', bd);
  } catch {
    // Examine the request/response to see what happened.
    console.log(`response status code = ${rest.responseStatusCode}`);
    console.log(`response status text = ${rest.responseStatusText}`);
    console.log(`response header: ${rest.responseHeader}`);
    console.log(`response body (if any): ${bd.getString('utf-8')}`);
    console.log('---');
    console.log(`LastRequestStartLine: ${rest.lastRequestStartLine}`);
    console.log(`LastRequestHeader: ${rest.lastRequestHeader}`);
    return;
  }

  // Save the contents of bd to a file.
  success = true;
  try {
    bd.writeFile('qa_output/penguins.jpg');
  } catch {
    success = false;
  }

  console.log(`Success: ${success}`);
}