(JavaScript) Example: Http.DownloadAppend method

Demonstrates the DownloadAppend method.

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

var success = false;

success = false;

var targetPath = "c:/temp/qa_output/download.txt";

var http = new CkHttp();
http.KeepResponseBody = true;

// Assume the target file in the local filesystem does not yet exist.
success = http.DownloadAppend("https://chilkatsoft.com/testData/helloWorld.txt",targetPath);
var statusCode = http.LastStatus;
if (statusCode == 0) {
    // Unable to either send the request or get the response.
    console.log(http.LastErrorText);
    return;
}

// Should be 200.
console.log("Response status code: " + statusCode);

// Examine the contents of the file.
var sb = new CkStringBuilder();
sb.LoadFile(targetPath,"utf-8");
console.log(sb.GetAsString());

// Output: 
// Response status code: 200
// Hello World!

// Download another text file and append to the target file.
success = http.DownloadAppend("https://chilkatsoft.com/testData/this_is_a_test.txt",targetPath);
statusCode = http.LastStatus;
if (statusCode == 0) {
    // Unable to either send the request or get the response.
    console.log(http.LastErrorText);
    return;
}

// Should be 200.
console.log("Response status code: " + statusCode);

// Examine the contents of the file.
sb.LoadFile(targetPath,"utf-8");
console.log(sb.GetAsString());

// Output:
// Response status code: 200
// Hello World!This is a Test.

// Delete the local target file.
var fac = new CkFileAccess();
fac.FileDelete(targetPath);

// Try to download a file that does not exist:
success = http.DownloadAppend("https://chilkatsoft.com/testData/does_not_exist.txt",targetPath);
statusCode = http.LastStatus;
if (statusCode == 0) {
    // Unable to either send the request or get the response.
    console.log(http.LastErrorText);
}
else {
    // We got a response, and we already know it wasn't a 200 success response.
    // It should be a 404 not found.
    console.log("Response status code: " + statusCode);
    // Examine the response body.
    console.log("Response body:");
    console.log(http.LastResponseBody);
}