B4X

HTTP Request Boundary Property

Explains and demonstrates the HTTP request Boundary property. For multipart HTTP requests, Chilkat auto-generates a boundary string when the Boundary property is left unset (or empty). For example:

POST /something HTTP/1.1
Content-Type: multipart/form-data; boundary=------------090207000006060206010508
Host: domain
Content-Length: 378

--------------090207000006060206010508
Content-Disposition: form-data; name="fileA"; filename="fileA.txt"
Content-Type: text/plain

This is the contents of file A
--------------090207000006060206010508
Content-Disposition: form-data; name="fileB"; filename="fileB.txt"
Content-Type: text/plain

This is the contents of file B
--------------090207000006060206010508--

If the Boundary property is set, then Chilkat uses it. For example, if the Boundary property is set to "ABC123HELLOWORLD"

POST /something HTTP/1.1
Content-Type: multipart/form-data; boundary=ABC123HELLOWORLD
Host: domain
Content-Length: 318

--ABC123HELLOWORLD
Content-Disposition: form-data; name="fileA"; filename="fileA.txt"
Content-Type: text/plain

This is the contents of file A
--ABC123HELLOWORLD
Content-Disposition: form-data; name="fileB"; filename="fileB.txt"
Content-Type: text/plain

This is the contents of file B
--ABC123HELLOWORLD--

B4X

Dim req As ChilkatHttpRequest
req.Initialize

req.HttpVerb = "POST"
req.Path = "/something"
req.ContentType = "multipart/form-data"

req.AddStringForUpload("fileA", "fileA.txt", "This is the contents of file A", "utf-8")
req.AddStringForUpload("fileB", "fileB.txt", "This is the contents of file B", "utf-8")

'  When the Boundary property is empty (has not yet been set)
'  Chilkat auto-generates a random boundary for the request.
'  This should almost always be sufficient.
'  For example, one can see the generated boundary here:
Log(req.GenerateRequestText)

'  If the Boundary property is set to a specific string, then the
'  request will use it:
req.Boundary = "ABC123HELLOWORLD"
Log(req.GenerateRequestText)