Zig Requires Chilkat v11.0.0+

How to Access Parts of a multipart/related HTTP Response

See more HTTP Examples

Demonstrates how to access the parts of a multipart/related response. This example sends a ficticious multipart/related request, and handles a ficticious multipart/related response.

We send the following multipart/related request:

Content-Type: multipart/related; start-info="text/xml"; type="application/xop+xml"; boundary="----=_Part_0_1744155.1118953559416"
Content-Length: 3453
SOAPAction: "some-SOAP-action"

------=_Part_1_4558657.1118953559446
Content-Type: application/xop+xml; type="text/xml"; charset=utf-8

<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Body>
    <Detail xmlns="http://example.org/mtom/data">
      <image>
        <xop:Include xmlns:xop="http://www.w3.org/2004/08/xop/include" href="cid:5aeaa450-17f0-4484-b845-a8480c363444@example.org" />
      </image>
    </Detail>
  </soap:Body>
</soap:Envelope>

------=_Part_1_4558657.1118953559446
Content-Type: image/jpeg
Content-ID: <5aeaa450-17f0-4484-b845-a8480c363444@example.org>


... binary data ...

Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

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

    const http = try chilkat.Http.init();
    defer http.deinit();

    const soap_xml = try chilkat.Xml.init();
    defer soap_xml.deinit();

    // Build the following SOAP XML

    // <soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
    //   <soap:Body>
    //     <Detail xmlns="http://example.org/mtom/data">
    //       <image>
    //         <xop:Include xmlns:xop="http://www.w3.org/2004/08/xop/include" href="cid:5aeaa450-17f0-4484-b845-a8480c363444@example.org" />
    //       </image>
    //     </Detail>
    //   </soap:Body>
    // </soap:Envelope>

    soap_xml.setTag("soap:Envelope");
    soap_xml.addAttribute("xmlns:soap", "http://schemas.xmlsoap.org/soap/envelope/") catch {};
    soap_xml.updateAttrAt("soap:Body|Detail", true, "xmlns", "http://example.org/mtom/data") catch {};
    soap_xml.updateAttrAt("soap:Body|Detail|image|xop:Include", true, "xmlns:xop", "http://www.w3.org/2004/08/xop/include") catch {};
    soap_xml.updateAttrAt("soap:Body|Detail|image|xop:Include", true, "href", "cid:5aeaa450-17f0-4484-b845-a8480c363444@example.org") catch {};

    soap_xml.setEmitXmlDecl(false);
    const xml_body = try soap_xml.getXml(alloc);
    std.debug.print("{s}\n", .{xml_body});

    const req = try chilkat.HttpRequest.init();
    defer req.deinit();
    req.setHttpVerb("POST");
    req.setPath("/something/someTarget");

    req.setContentType("multipart/related; start-info=\"text/xml\"; type=\"application/xop+xml\"");
    req.addHeader("SOAPAction", "some-SOAP-action");

    try req.addStringForUpload2("", "", xml_body, "utf-8", "application/xop+xml; type=\"text/xml\"; charset=utf-8");

    // The bytes will be sent as binary (not base64 encoded).
    try req.addFileForUpload2("", "qa_data/jpg/starfish.jpg", "image/jpeg");

    // The JPEG data is the 2nd sub-part, and therefore is at index 1 (the first sub-part is at index 0)
    try req.addSubHeader(1, "Content-ID", "<5aeaa450-17f0-4484-b845-a8480c363444@example.org>");

    http.setFollowRedirects(true);

    const use_tls = true;
    const resp = try chilkat.HttpResponse.init();
    defer resp.deinit();
    http.httpSReq("www.example.org", 443, use_tls, req, resp) catch {
        std.debug.print("{s}\n", .{try http.getLastErrorText(alloc)});
        return;
    };

    // Imagine the HTTP response is multipart related and is something like this:

    // HTTP/1.1 200 OK
    // Cache-Control: no-cache, no-store
    // Pragma: no-cache
    // Transfer-Encoding: chunked
    // Content-Type: multipart/related; boundary=------------080001080500020607080905
    // Expires: -1
    // Server: Microsoft-IIS/10.0
    // X-AspNet-Version: 4.0.30319
    // X-Powered-By: ASP.NET
    // Date: Wed, 19 Feb 2020 15:27:06 GMT
    //
    // --------------080001080500020607080905
    // Content-Type: application/xop+xml; charset=iso-8859-1
    // Content-Id: RootPart
    // Content-Transfer-Encoding: binary
    //
    // <?xml version="1.0" encoding="iso-8859-1"?>
    // <soapenv:Envelope xmlns:xcpt="...">
    //   <soapenv:Header />
    //   <soapenv:Body>
    //     <xres:Transport profile="http://something.example.com/..." version="1.4">
    //       <xres:TransportHeader>
    //     ...
    //     ...
    //       </xres:TransportHeader>
    //       <xres:TransportBody />
    //     </xres:Transport>
    //   </soapenv:Body>
    // </soapenv:Envelope>
    // --------------080001080500020607080905--

    // To get the XML, load the full MIME of the response into a Chilkat MIME object.  Then get the body of the 1st sub-part.
    const mime = try chilkat.Mime.init();
    defer mime.deinit();
    mime.loadMime(try resp.getFullMime(alloc)) catch {};

    // Your code might verify that the Content-Type is indeed multipart/related.
    std.debug.print("{s}\n", .{try mime.getContentType(alloc)});
    std.debug.print("num parts = {d}\n", .{mime.getNumParts()});

    // Assuming it is, and the number of sub-parts is > 0
    if (mime.getNumParts() > 0) {
        const part0 = try chilkat.Mime.init();
        defer part0.deinit();
        mime.partAt(0, part0) catch {};

        // The Content-Type (in this ficticious example) should be "application/xop+xml"
        std.debug.print("sub-part Content-Type: {s}\n", .{try part0.getContentType(alloc)});
        // Now get the XML
        const sub_part_xml_body = try part0.getBodyDecoded(alloc);
        std.debug.print("{s}\n", .{sub_part_xml_body});
    }
}