Visual FoxPro

Building a multipart/form-data Request for HTTP Upload

See more HTTP Examples

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--

Visual FoxPro

LOCAL loReq
LOCAL lcRequestMime

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

loReq = CreateObject('Chilkat.HttpRequest')

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

* View the request that would be sent if HttpSReq was called:
lcRequestMime = loReq.GenerateRequestText()
? lcRequestMime

* 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

RELEASE loReq