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windows - How to make IIS 7/8 rewrite and redirect URL with DB Provider

Please, have patience if this question is long but I have never worked on this complex program which was developed by colleague of mine before I was recruited.



We have this web application running on .NET Framework v2.0 CLR. Anyway, this program is not natively written in C# but we must use a framework called Instant Developer which converts the code in a .NET application. The application runs in a Windows Server 2012 R2 under IIS 8 and with SQL Server 2014 R2.




So, inside this application there is a very big directory called "photos" which contains a photo of each work a user completes. When the program was developed, our customer told us that very few photos were compulsory so my
colleague thought that a unique directory was enough. But in this years the requirements have changed. Therefore, now a photo must be taken for each work and so that directory today contains more than 5 millions of files. Consequently, it is not openable anymore by Windows Explorer, if I try the server blocks. Last month, our server was attacked by a crypto locker and my bosses decided to pay in order to get a decrypter otherwise our custmomer will ask us to pay a fine for each file which was lost. As soon as we have finished to recover our files, my boss asked to divide this huge directory into sub directories like /year/month/day. This can be easily done by a python script but the problem is that our customer registered in SAP a link to see that photo of this form



https://www.ourserver.it/applicationName/photo/file.jpg


and they told us they will refuse to change it.
So, I would like to change the path of the photo in the database and, somehow, give instructions to IIS 8 in order that when it receives a URL like the previous, it should query the datatabase, discover the new path and then redirect the client to a new URL like:



https://www.ourserver.it/applicationName/photo/year/month/day/file.jpg



This event is not catchable by the framework we use, that's why I need to program IIS in this way.



So, I strictly followed this guide and I installed URL Rewrite extensibility code samples.



In IIS I've added a re-write URL provider called DB to my web application (in its site inside IIS) which should call a stored procedure on a SQL Server Database.
The stored procedure works fine: given an old URL it queries a table on a specific new databse (as the guide suggested) and returns the new one. Running:



exec dbo.GetRewrittenUrl @input='http://localhost/OmniService/foto/18443151-810079.jpg'



I get this result: http://localhost/OmniService/foto/2017/02/02/18443151-810079.jpg



Here's what I have on web.config file:




So, according to that table if I perform




http://localhost/OmniService/foto/18443151-810079.jpg


I expect to be returned



http://localhost/OmniService/foto/2017/02/02/18443151-810079.jpg


This does not happen and I get a 404 HTTP Error and there's no new URL. Or simetimes I get a 500 Internal Server Error.
The regular expression is correct and it is recognised because I tested it with IIS. So, I supposed there a sort of problem with the comunication between IIS and the DBMS. I've tried to write some python script to test the given string connection is correct and so it seems. But there are too many possibilities to write a string connection. Which is the correct?

How can I detect the error? What the hell am I missing? I've been working on this for more than 10 hours and I don't know where to look for the mistake.
Could you please help?

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