MOTOBIT.COM - ASP upload, IIS utility 2GB upload limit for http uploads and very large forms - 100MB, 2GB (4GB) Article

       Q: Hi, is it possible to set the upload limit on Huge ASP to a file size greater than 2gb? 2gb is too small, we are needing to upload hi-res video files of 3.5gb at times.

    HugeASP upload is designed to work with up to 2GB files. The reason for the limit is simple - current browsers does not support upload of bigger files than 2GB over internet and IIS6 also accepts only 2GB files, no more.

    I tried several browsers to upload files over 2gb and the results are on this page.

Mozilla firefox

Upload file over 2GB - you cannot post such file, Mozilla does not send request with bigger file to server

Upload two or more files with size summary size >2GB - Mozilla send such files, but http headers are funny:

POST /content-length-test.htm HTTP/1.1
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.2; en-US) Gecko/20060909 Firefox/1.5.0.7
Content-Type: multipart/form-data; 
			boundary=---------------------------28146504217367
Content-Length: -1618952669
			

But IIS doesn't  know what means "Content-Length: -1618952669" and it answers "Bad request"

Internet Explorer

The results with IE are similar - IE allows to post file over 2GB, but the http headers looks like in Mozilla:

POST /content-length-test.htm HTTP/1.1
Content-Type: multipart/form-data; boundary=---------------------------7d630d6400da
UA-CPU: x86
User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2; )
Content-Length: -107389343
			

      Both major internet browsers simply count content-length of uploads in 32bit signed integer, so their results are unusable for very large uploads.

IIS, ASP, V6.0

      I prepared a simple test for IIS6 - POST with 30GB Content-Length:

POST /content-length-test.asp HTTP/1.1
Content-Type: multipart/form-data; boundary=--------------------------------08235985
Content-Length: 30000000000
User-Agent: Hammoun/1.0 (WinNT 5.2.3790;Service Pack 1)
			

      And the IIS answer is next

HTTP/1.1 500 Internal Server Error
Content-Type: text/html
Server: Microsoft-IIS/6.0
X-Powered-By: ASP.NET
			

      You can post up to 4294967295 bytes to IIS, but ASP request.totalbytes returns -1 for post size over 2GB. So the maximum useful limit in ASP is also 2GB.

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