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(.NET Core C#) Building a multipart/form-data Request for HTTP UploadUploading files to a web server typically requires building a multipart/form-data request where the files are contained in the sub-parts of the MIME request. Note: HTTP uploads require code on the server-side to receive the upload. For example, see Complete C# ASP.NET HTTP Upload Example This example produces the following HTTP multipart/form-data request: POST /something HTTP/1.1 Content-Type: multipart/form-data; boundary=------------070002080409050901090203 Host: domain Content-Length: 546 --------------070002080409050901090203 Content-Disposition: form-data; name="fileA"; filename="fileA.txt" Content-Type: text/plain This is the contents of file A --------------070002080409050901090203 Content-Disposition: form-data; name="fileB"; filename="fileB.txt" Content-Type: text/plain This is the contents of file B --------------070002080409050901090203 Content-Disposition: form-data; name="fileC"; filename="fileC.txt" Content-Type: text/plain This is the contents of file C --------------070002080409050901090203--
// This example demonstrates building a multipart/form-data request. Chilkat.HttpRequest req = new Chilkat.HttpRequest(); // The ContentType, HttpVerb, and Path properties should // always be explicitly set. req.HttpVerb = "POST"; req.Path = "/something"; req.ContentType = "multipart/form-data"; // The contents and name of each file to be uploaded is provided // by calling any of the following methods: // AddBytesForUpload // AddBytesForUpload2 // AddFileForUpload // AddFileForUpload2 // AddStringForUpload // AddStringForUpload2 // For this example, we'll provide the contents of the files to be uploaded // directly as in-memory strings. req.AddStringForUpload("fileA","fileA.txt","This is the contents of file A","utf-8"); req.AddStringForUpload("fileB","fileB.txt","This is the contents of file B","utf-8"); req.AddStringForUpload("fileC","fileC.txt","This is the contents of file C","utf-8"); // View the request that would be sent if SynchronousRequest was called: string requestMime = req.GenerateRequestText(); Debug.WriteLine(requestMime); // A few important comments about the HTTP request that is generated: // // 1) Chilkat automatically generates a random boundary string. In 99.999% of cases, this should // be sufficient. // 2) The Content-Length header is automatically generated based on the actual length of the MIME message // that follows the intial (topmost) MIME header. // 3) The HOST header will automatically get filled in with the actual domain when SynchronousRequest // is called |
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