B4X

HTTP multipart/form-data Upload

See more HTTP Examples

Demonstrates how to upload files to an HTTP server using a multipart/form-data POST. 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 http As ChilkatHttp
http.Initialize("http")

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

'  Send an "Expect: 100-continue" header in the request.
'  This causes the HTTP server to end a 100-continue response
'  immediately after receiving the HTTP header.  The client
'  (Chilkat) will receive this intermediate response, and if
'  it's not an error response, it knows that the HTTP server will
'  accept the data that is forthcoming.
'  The alternative is to get an error response after trying to upload
'  the entire contents of the files.
req.AddHeader("Expect", "100-continue")

'  Call AddFileForUpload2 for each file to be uploaded in the HTTP multipart/form-data POST
'  To allow Chilkat to determine the content-type automatically based on file-extension,
'  call AddFileForUpload instead.

'  The 1st arg is the filename passed in the HTTP request.
'  The 2nd arg is the path in the local filesytem.
'  The file is not loaded into memory.  It is streamed directly from the file
'  when the HTTP POST is sent.
success = req.AddFileForUpload2("starfish.jpg", "c:/qa_data/starfish.jpg", "image/jpg")
If success = False Then
    Log(req.LastErrorText)
    Return
End If


success = req.AddFileForUpload("something.pdf", "c:/qa_data/something.pdf")
If success = False Then
    Log(req.LastErrorText)
    Return
End If


'  Its also possible to add a file from a string:
success = req.AddStringForUpload("test.xml", "test.xml", "<abc>This is the test.xml content</abc>", "utf-8")
'  We'll assume success since no files are involved..

'  This sends the HTTP request (with 3 files being uploaded) to
'  http://www.mywebserver123abc.com/rcvFormDataUpload.aspx
Dim resp As ChilkatHttpResponse
resp.Initialize
success = http.HttpSReq("www.mywebserver123abc.com", 80, False, req, resp)
If success = False Then
    Log(http.LastErrorText)
    Return
End If


Log("HTTP response status: " & resp.StatusCode)
'  See the online reference documentation for 
'  other information that can be obtained from the response object.

'  To send using SSL/TLS, do this instead.
'  This sends to https://www.mywebserver123abc.com/rcvFormDataUpload.aspx
success = http.HttpSReq("www.mywebserver123abc.com", 443, True, req, resp)
If success = False Then
    Log(http.LastErrorText)
    Return
End If


Log("HTTP response status: " & resp.StatusCode)
'  See the online reference documentation for 
'  other information that can be obtained from the response object.