(Node.js) 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.

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOSX, and ARM

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node21-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node21-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node21-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node21-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node21-linux64');
    }
} else if (os.platform() == 'darwin') {
    if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node21-mac-m1');
    } else {
        var chilkat = require('@chilkat/ck-node21-macosx');
    }
}

function chilkatExample() {

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

    var success;
    var http = new chilkat.Http();

    var req = new chilkat.HttpRequest();

    // ...
    // 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.
    // resp: HttpResponse
    var resp = http.SynchronousRequest("www.somedomain.com",443,true,req);
    if (http.LastMethodSuccess !== true) {
        console.log(http.LastErrorText);
        return;
    }

    // Get the response body (which is expected to be binary)
    var respBody = new chilkat.BinData();
    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 chilkat.Mime();
    success = mime.LoadMimeBd(respBody);
    if (success !== true) {
        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.
    // part0: Mime
    var part0 = mime.GetPart(0);
    // 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..)
    // part1: Mime
    var part1 = mime.GetPart(1);
    success = part1.SaveBody("qa_output/attachedZip.zip");

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

    console.log("OK.");

}

chilkatExample();