Parse yaws get query

Question

This crashed

out(A) ->
    io:format("~wqqq12", yaws_api:queryvar(A, "id"), yaws_api:parse_query(A)),

with this

Reason: {function_clause,
            [{io,request,
                 ["~wqqq12",{format,undefined,[{"id","F1D79543E9E6583B"}]}]},

But it's clear that "id" is present in the get query. Why can't it parse it?

edited:

And query: *.yaws?id=F1D79543E9E6583B

edited2:

sorry for misleading, but i use format for send values to browser, its intended error. I'm intersted in why second argument in format becomes "undefined".

Answer 1

You are calling io:format the wrong way. The correct is:

io:format(Format, ListOfParams)

Where Format is a String and ListOfParams is a list of terms to be used in your format.

Check the io:format/2 manual for more details.