I have a Windows / Apache2 / PHP application that receives a file using encoded encoding. The reason is that the downloaded file is dynamic and its length is unknown before transfer. It always worked great.
Now I need to port the application to IIS7 / PHP. The problem is that IIS cannot get the chunked file: when the file is downloaded, the server simply does not respond at all. How to solve this?
Please note that in my test I do not even use PHP. I just have the .php extension because IIS refuses POST in the .htm file (which makes sense).
As rupello suggested in this answer , I checked cURL to make sure my client is not broken. cURL also cannot get a response, although everything works fine if the transfer fails.
I did the following tests:
test.php:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf8" />
</head>
<body>
<form method="post" enctype="multipart/form-data">
File: <input type="file" name="upfile" />
<input type="submit" value="go"/>
</form>
</body>
</html>
This command does not return (stuck waiting for a response)
curl.exe http://serveur/test.php --form "upfile=@text.txt"
-H "Transfer-Encoding: chunked" -H "Expect:"
Note: -H "Expect:"is the suppression Expect 100-Continueissued by curl. The result is the same without this header, and, of course, an additional circuit. Sent:
POST http://serveur/test.php HTTP/1.1
User-Agent: curl/7.15.3 (i586-pc-mingw32msvc) libcurl/7.15.3 zlib/1.2.2
Host: serveur
Pragma: no-cache
Accept: */*
Connection: Keep-Alive
Transfer-Encoding: chunked
Content-Type: multipart/form-data; boundary=----------------------------310dbcc6761b
8c
------------------------------310dbcc6761b
Content-Disposition: form-data; name="upfile"; filename="text.txt"
Content-Type: text/plain
5
hello
30
------------------------------310dbcc6761b--
0
Problem: nothing is returned by the server. The server looks like it is waiting. the curl does not return.
The same command without chunk encoding works as expected:
Sent:
POST http://serveur/test.php HTTP/1.1
User-Agent: curl/7.15.3 (i586-pc-mingw32msvc) libcurl/7.15.3 zlib/1.2.2
Host: serveur
Pragma: no-cache
Accept: */*
Connection: Keep-Alive
Content-Length: 193
Content-Type: multipart/form-data; boundary=----------------------------e2d761bc173a
------------------------------e2d761bc173a
Content-Disposition: form-data; name="upfile"; filename="text.txt"
Content-Type: text/plain
hello
------------------------------e2d761bc173a--
Now the server responds correctly:
HTTP/1.1 200 OK
Content-Type: text/html
Server: Microsoft-IIS/7.5
X-Powered-By: PHP/5.3.8
X-Powered-By: ASP.NET
Date: Mon, 21 Nov 2011 10:47:57 GMT
Content-Length: 272
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf8" />
</head>
<body>
<form method="post" enctype="multipart/form-data">
File: <input type="file" name="upfile" />
<input type="submit" value="go"/>
</form>
</body>
</html>
Testing on a LAMP server with the same files and requests works fine.
So, how do I enable request encoding on IIS?
. ASP, :
C:\...\inetsrv>appcmd.exe set config /section:asp /enableChunkedEncoding:True
Applied configuration changes to section "system.webServer/asp" for "MACHINE/
WEBROOT/APPHOST" at configuration commit path "MACHINE/WEBROOT/APPHOST"