(Swift 3,4,5...) Building a multipart/form-data Request for HTTP Upload

Uploading files to a web server typically requires building a multipart/form-data request where the files are contained in the sub-parts of the MIME request.

Note: HTTP uploads require code on the server-side to receive the upload. For example, see Complete C# ASP.NET HTTP Upload Example

This example produces the following HTTP multipart/form-data request:

POST /something HTTP/1.1
Content-Type: multipart/form-data; boundary=------------070002080409050901090203
Host: domain
Content-Length: 546

--------------070002080409050901090203
Content-Disposition: form-data; name="fileA"; filename="fileA.txt"
Content-Type: text/plain

This is the contents of file A
--------------070002080409050901090203
Content-Disposition: form-data; name="fileB"; filename="fileB.txt"
Content-Type: text/plain

This is the contents of file B
--------------070002080409050901090203
Content-Disposition: form-data; name="fileC"; filename="fileC.txt"
Content-Type: text/plain

This is the contents of file C
--------------070002080409050901090203--

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

func chilkatTest() {
    // This example demonstrates building a multipart/form-data request.

    let req = CkoHttpRequest()!

    // The ContentType, HttpVerb, and Path properties should
    // always be explicitly set.
    req.httpVerb = "POST"
    req.path = "/something"
    req.contentType = "multipart/form-data"

    // The contents and name of each file to be uploaded is provided
    // by calling any of the following methods:
    // AddBytesForUpload
    // AddBytesForUpload2
    // AddFileForUpload
    // AddFileForUpload2
    // AddStringForUpload
    // AddStringForUpload2

    // For this example, we'll provide the contents of the files to be uploaded
    // directly as in-memory strings.
    req.addString(forUpload: "fileA", filename: "fileA.txt", strData: "This is the contents of file A", charset: "utf-8")
    req.addString(forUpload: "fileB", filename: "fileB.txt", strData: "This is the contents of file B", charset: "utf-8")
    req.addString(forUpload: "fileC", filename: "fileC.txt", strData: "This is the contents of file C", charset: "utf-8")

    // View the request that would be sent if SynchronousRequest was called:
    var requestMime: String? = req.generateText()
    print("\(requestMime!)")

    // A few important comments about the HTTP request that is generated:
    // 
    // 1) Chilkat automatically generates a random boundary string.   In 99.999% of cases, this should 
    //    be sufficient.
    // 2) The Content-Length header is automatically generated based on the actual length of the MIME message
    //    that follows the intial (topmost) MIME header.
    // 3) The HOST header will automatically get filled in with the actual domain when SynchronousRequest
    //    is called

}