[Connect origins to destinations] A potentially dangerous Request.Path value error

[SafaFennia]

Hi,

I'm using ArcGIS API for Python to connect origins and destinations. I have a point feature layer in my AGO and when I apply a filter on it to select my ODs (800 origins and 1 destination) I get this message error. What does it mean ?

Is it because my filter string is too long ?

Thank you in advance !

[simoxu]

It seems there are some invalid characters in your request path. but it's hard to do any further analysis without seeing your code and knowing the environment your code is running in.