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Building a multipart/form-data Request for HTTP Upload

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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--

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; This example demonstrates building a multipart/form-data request.

$oReq = ObjCreate("Chilkat.HttpRequest")

; The ContentType, HttpVerb, and Path properties should
; always be explicitly set.
$oReq.HttpVerb = "POST"
$oReq.Path = "/something"
$oReq.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.
$oReq.AddStringForUpload("fileA","fileA.txt","This is the contents of file A","utf-8")
$oReq.AddStringForUpload("fileB","fileB.txt","This is the contents of file B","utf-8")
$oReq.AddStringForUpload("fileC","fileC.txt","This is the contents of file C","utf-8")

; View the request that would be sent if HttpSReq was called:
Local $sRequestMime = $oReq.GenerateRequestText()
ConsoleWrite($sRequestMime & @CRLF)

; 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 HttpSReq
;    is called