C#

HTTP multipart/form-data Upload

See more HTTP Examples

Demonstrates how to upload files to an HTTP server using a multipart/form-data POST. C#

bool success = false;

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

Chilkat.Http http = new Chilkat.Http();

Chilkat.HttpRequest req = 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.
success = req.AddFileForUpload2("starfish.jpg","c:/qa_data/starfish.jpg","image/jpg");
if (success == false) {
    Debug.WriteLine(req.LastErrorText);
    return;
}

success = req.AddFileForUpload("something.pdf","c:/qa_data/something.pdf");
if (success == false) {
    Debug.WriteLine(req.LastErrorText);
    return;
}

//  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
Chilkat.HttpResponse resp = new Chilkat.HttpResponse();
success = http.HttpSReq("www.mywebserver123abc.com",80,false,req,resp);
if (success == false) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

Debug.WriteLine("HTTP response status: " + Convert.ToString(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) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

Debug.WriteLine("HTTP response status: " + Convert.ToString(resp.StatusCode));
//  See the online reference documentation for 
//  other information that can be obtained from the response object.