(JavaScript) Parse Multipart Binary Http Response

This example demonstrates how to parse an HTTP response that is multipart and contains a binary file, such as a .zip or .pdf.

Note: This example requires Chilkat v11.0.0 or greater.

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;

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

var http = new CkHttp();
var req = new CkHttpRequest();

// ...
// Insert code here to construct some kind of HTTP request.
// this example is to show how to parse a particular kind of response.
// ...
// ...

// Send the request (whatever it may be in your case) to get the HTTP response object.
var resp = new CkHttpResponse();
success = http.HttpSReq("www.somedomain.com",443,true,req,resp);
if (success == false) {
    console.log(http.LastErrorText);
    return;
}

// Get the response body (which is expected to be binary)
var respBody = new CkBinData();
resp.GetBodyBd(respBody);

// For this example, the response body contains something like this:

// ------=_Part_21302_2029949381.1547401515443
// Content-Type: application/xop+xml; charset=UTF-8; type="text/xml"
// Content-Transfer-Encoding: 8bit
// Content-ID: <rootpart@ws.jboss.org>
// 
// <env:Envelope xmlns:env='http://schemas.xmlsoap.org/soap/envelope/'><env:Header></env:Header><env:Body>...</env:Body></env:Envelope>
// ------=_Part_21302_2029949381.1547401515443
// Content-Type: application/octet-stream
// Content-Transfer-Encoding: binary
// Content-Id: <fileArchivio-7d302908-4d64-43d3-bf4e-79ce806d43b3@ws.jboss.org>
// 
// BINARY_CONTENT_HERE...
// 
// ------=_Part_21302_2029949381.1547401515443--
// 

// Load it into a Chilkat MIME object.
var mime = new CkMime();
success = mime.LoadMimeBd(respBody);
if (success == false) {
    console.log(mime.LastErrorText);
    return;
}

var numParts = mime.NumParts;
if (numParts < 2) {
    console.log("Expected multipart MIME with at least 2 sub-parts.");
    return;
}

// Get the 1st sub-part, which is the XML.

var part0 = new CkMime();
mime.PartAt(0,part0);

// Should be OK because we checked NumParts above..
var xmlStr = part0.GetBodyDecoded();
console.log(xmlStr);
console.log("----");

// Save the 2nd part to a file.  (It is a .zip file in our test case..)

var part1 = new CkMime();
mime.PartAt(1,part1);

success = part1.SaveBody("qa_output/attachedZip.zip");

// Alternatively, we could extract the binary data to a BinData and use elsewhere..
var zipData = new CkBinData();
success = part1.GetBodyBd(zipData);
success = zipData.WriteFile("qa_output/attachedZip_again.zip");

console.log("OK.");