Looking at this http://www.dotnetperls.com/ashx
I might have bits of code like this:
string file = context.Request.QueryString["file"];
if (file == "logo")
{
r.WriteFile("Logo1.png");
}
else
{
r.WriteFile("Flower1.png");
}
That should allow me to see different things depending on URL that I enter in a browser, for example:
http://www.dotnetperls.com/?file=logo
http://www.dotnetperls.com/?file=sth_else_eg_flower
The problem I am facing now is how, knowing just http://www.dotnetperls.com/?file can I read what the all the assumed options of the file variable are? In this case it would be "logo" and anything else.
What I have in reality is http://www.somewebstie.com/somefile.ashx?somevariable=. I can Google up the string to get few results (i.e. http://www.somewebstie.com/somefile.ashx?somevariable=abcde or http://www.somewebstie.com/somefile.ashx?somevariable=xyz) thus I know it exists and is somehow searchable. I just would like to know all the other "abcde" and "xyz". If I try just http://www.somewebstie.com/somefile.ashx I get a singe line error saying that I am giving a wrong variable and I cannot see anything important in the source of the site.
What might be important here - I have zero knowledge about web technologies.
You can't get this information. Its all hidden in the code implementation. There is no published format (by default) that will show you all of the available options the code is looking for.