Chilkat2-Python
REST Stream Multipart Body from File

Demonstrates how to send a multipart/form-data HTTP request, where one of the parts contains data streamed directly from a file. This is good for cases where the file to be uploaded is very large.
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Chilkat2-Python
import sys
import chilkat2

success = False

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

rest = chilkat2.Rest()

# Connect to the destination web server.
bTls = True
port = 443
bAutoReconnect = True
success = rest.Connect("www.somewebserver.com",port,bTls,bAutoReconnect)

# This example will send the following multipart/form-data request.
# The Content-Length is automatically computed and added by Chilkat.

# 	POST /some_path HTTP/1.1
# 	Content-Type: multipart/form-data; boundary=---------------------------735323031399963166993862150
# 	Content-Length: 834
# 
# 	-----------------------------735323031399963166993862150
# 	Content-Disposition: form-data; name="text1"
# 
# 	text 123 abc
# 	-----------------------------735323031399963166993862150
# 	Content-Disposition: form-data; name="text2"
# 
# 	xyz
# 	-----------------------------735323031399963166993862150
# 	Content-Disposition: form-data; name="file1"; filename="a.txt"
# 	Content-Type: text/plain
# 
# 	Content of a.txt.
# 
# 	-----------------------------735323031399963166993862150
# 	Content-Disposition: form-data; name="file2"; filename="a.html"
# 	Content-Type: text/html
# 
# 	<!DOCTYPE html><title>Content of a.html.</title>
# 
# 	-----------------------------735323031399963166993862150
# 	Content-Disposition: form-data; name="file3"; filename="starfish.jpg"
# 	Content-Type: image/jpeg
# 
# 	binary data goes here
# 	-----------------------------735323031399963166993862150--

# Set the Content-Type for the topmost MIME part.
rest.AddHeader("Content-Type","multipart/form-data")

# Specify each part of the request.
rest.PartSelector = "1"
rest.AddHeader("Content-Disposition","form-data; name=\"text1\"")
rest.SetMultipartBodyString("text 123 abc")

rest.PartSelector = "2"
rest.AddHeader("Content-Disposition","form-data; name=\"text2\"")
rest.SetMultipartBodyString("xyz")

rest.PartSelector = "3"
rest.AddHeader("Content-Disposition","form-data; name=\"file1\"; filename=\"a.txt\"")
rest.AddHeader("Content-Type","text/plain")
rest.SetMultipartBodyString("Content of a.txt.")

rest.PartSelector = "4"
rest.AddHeader("Content-Disposition","form-data; name=\"file2\"; filename=\"a.html\"")
rest.AddHeader("Content-Type","text/html")
sbHtml = chilkat2.StringBuilder()
sbHtml.LoadFile("qa_data/html/a.html","utf-8")
rest.SetMultipartBodySb(sbHtml)

rest.PartSelector = "5"
rest.AddHeader("Content-Disposition","form-data; name=\"file3\"; filename=\"starfish.jpg\"")
rest.AddHeader("Content-Type","image/jpeg")

# When the request is sent, stream this part directly from the file.
# This avoids having to load the entire file into memory.
fileStream = chilkat2.Stream()
fileStream.SourceFile = "qa_data/jpg/starfish.jpg"
rest.SetMultipartBodyStream(fileStream)

responseBody = rest.FullRequestMultipart("POST","/some_path")
if (rest.LastMethodSuccess != True):
    print(rest.LastErrorText)
    sys.exit()

# ...
# ...

# Clear the REST object for any subsequent requests..
rest.ClearAllHeaders()
rest.ClearAllParts()
rest.PartSelector = ""