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(VB.NET) HTTP multipart/form-data UploadDemonstrates how to upload files to an HTTP server using a multipart/form-data POST.
' This example requires the Chilkat API to have been previously unlocked. ' See Global Unlock Sample for sample code. Dim http As New Chilkat.Http Dim req As New Chilkat.HttpRequest 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. Dim success As Boolean = req.AddFileForUpload2("starfish.jpg","c:/qa_data/starfish.jpg","image/jpg") If (success <> True) Then Debug.WriteLine(req.LastErrorText) Exit Sub End If success = req.AddFileForUpload("something.pdf","c:/qa_data/something.pdf") If (success <> True) Then Debug.WriteLine(req.LastErrorText) Exit Sub 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 Chilkat.HttpResponse resp = http.SynchronousRequest("www.mywebserver123abc.com",80,False,req) If (http.LastMethodSuccess <> True) Then Debug.WriteLine(http.LastErrorText) Else Debug.WriteLine("HTTP response status: " & resp.StatusCode) ' See the online reference documentation for ' other information that can be obtained from the response object. End If ' To send using SSL/TLS, do this instead. ' This sends to https://www.mywebserver123abc.com/rcvFormDataUpload.aspx resp = http.SynchronousRequest("www.mywebserver123abc.com",443,True,req) If (http.LastMethodSuccess <> True) Then Debug.WriteLine(http.LastErrorText) Else Debug.WriteLine("HTTP response status: " & resp.StatusCode) ' See the online reference documentation for ' other information that can be obtained from the response object. End If |
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