Web Query URL with "?" (question mark)

Hi,

I'm accessing some XML data via Web Query, and I have a problem with the question mark in my URL.

The following expression works pretty fine:

let
Source = Xml.Tables(Web.Contents("https://play.dhis2.org/2.28/api/categoryOptionCombos.xml"))
in
Source

However this one:

let
Source = Xml.Tables(Web.Contents("https://play.dhis2.org/2.28/api/categoryOptionCombos?pageSize=225.xml"))
in
Source

 is returning the error:

DataFormat.Error: Xml processing failed. Either the input is invalid or it isn't supported. (Internal error: Data at the root level is invalid. Line 1, position 1.)
Details:
Binary

Both URLs are valid and they work outside Power BI.

Any ideas how can I have my problem solved?

Best regards,

Miszel