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I think …url.path.get(1) returns part of the path without the forward slashes. And then http.req.url.path.strip_start_chars starts from the first forward slash, so it will never match the beginning. This should do it :

HTTP.REQ.URL.PATH_AND_QUERY.STRIP_START_CHARS("/" + HTTP.REQ.URL.PATH.GET(1))

thx but I also tried HTTP.REQ.URL.PATH_AND_QUERY.STRIP_START_CHARS("/").STRIP_START_CHARS("myapp1") which works perfectly when the text is fixed. the problem is to use a pattern set or string map or anything dynamic like HTTP.REQ.URL.PATH.GET(1) which seems to be ignored inside of the strip function

Indeed it seems to accept only constants. Another way is using URL transformation or by using SUBSTR function based on length of first url path:

Thanks @Frank Vandebergh for the SUBSTR tip, that works perfect!