Port 9001 used by Microsoft-HTTPAPI/2.0

Solution 1:

After Daniel B comment I did the following:

$ netsh http show servicestate                                                      

Snapshot of HTTP service state (Server Session View):                               
-----------------------------------------------------                               

Server session ID: FF00000520000001                                                 
    Version: 2.0                                                                    
    State: Active                                                                   
    Properties:                                                                     
        Max bandwidth: 4294967295                                                   
        Timeouts:                                                                   
            Entity body timeout (secs): 120                                         
            Drain entity body timeout (secs): 120                                   
            Request queue timeout (secs): 120                                       
            Idle connection timeout (secs): 120                                     
            Header wait timeout (secs): 120                                         
            Minimum send rate (bytes/sec): 150                                      
    URL groups:                                                                     
    URL group ID: FE00000540000001                                                  
        State: Active                                                               
        Request queue name: Request queue is unnamed.                               
        Properties:                                                                 
            Max bandwidth: inherited                                                
            Max connections: inherited                                              
            Timeouts:                                                               
                Timeout values inherited                                            
            Number of registered URLs: 1                                            
            Registered URLs:                                                        
                HTTP://+:9001/IGCC/SERVICE/                                         

Request queues:                                                                     
    Request queue name: Request queue is unnamed.                                   
        Version: 2.0                                                                
        State: Active                                                               
        Request queue 503 verbosity level: Basic                                    
        Max requests: 1000                                                          
        Number of active processes attached: 1                                      
        Process IDs:                                                                
            5592      

And now I get the culprit Process IDs: 5592, IGGC/Service stands for
Intel Graphic Command Center