B4X

Add Data to multipart/form-data Request

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Demonstrates how to add content (such as a JPG, PDF, XML, etc.) to multipart/form-data requests. B4X

Dim success As Boolean = False

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

Dim req As ChilkatHttpRequest
req.Initialize
req.HttpVerb = "POST"
req.ContentType = "multipart/form-data"
req.Path = "/xyz/something"

req.AddParam("param1", "value1")
req.AddParam("param2", "value2")

'  Add some small files to the request. (Small so we can see what the full request looks like without too much data..)
Dim bd As ChilkatBinData
bd.Initialize
success = bd.LoadFile("qa_data/jpg/starfish20.jpg")
req.AddBdForUpload("starfish20", "starfish20.jpg", bd, "image/jpeg")

success = bd.LoadFile("qa_data/pdf/helloWorld.pdf")
req.AddBdForUpload("helloWorld", "helloWorld.pdf", bd, "application/pdf")

success = bd.LoadFile("qa_data/xml/tinyA.xml")
req.AddBdForUpload("tinyA", "tinyA.xml", bd, "text/xml")

'  This HTTP request contains binary data, so we cannot call GenerateRequestText
'  to examine it as a string.  We can instead call GenerateRequestFile
'  to write the request to a file and then examine using a hex editor,
'  or an editor that is capable of handling null bytes and non-printable chars (perhaps by displaying "?" chars instead).
req.GenerateRequestFile("qa_output/multipartFormDataRequest.bin")

Log("OK.")

'  This is the HTTP multipart/form-data request built by the above code:

'  POST /xyz/something HTTP/1.1
'  Host: domain
'  Content-Type: multipart/form-data; boundary=------------090708030009010000030901
'  Content-Length: 2220
'  
'  --------------090708030009010000030901
'  Content-Disposition: form-data; name="param1"
'  
'  value1
'  --------------090708030009010000030901
'  Content-Disposition: form-data; name="param2"
'  
'  value2
'  --------------090708030009010000030901
'  Content-Disposition: form-data; name="starfish20"; filename="starfish20.jpg"
'  Content-Type: image/jpeg
'  
'  JPEG DATA HERE...
'  --------------090708030009010000030901
'  Content-Disposition: form-data; name="helloWorld"; filename="helloWorld.pdf"
'  Content-Type: application/pdf
'  
'  PDF DATA HERE...
'  --------------090708030009010000030901
'  Content-Disposition: form-data; name="tinyA"; filename="tinyA.xml"
'  Content-Type: text/xml
'  
'  XML DATA HERE...
'  --------------090708030009010000030901--
'