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try expression can have of section and it will be evaluated only on no exception in exprs. but i feel some oddities on erlang's exception and that is the concept of class. well, at least, i understand the error handling of erlang.{/INSERTKEYS}{/PARAGRAPH} here is the verbose code. after consdering the various code, i come up with this code. if you don't care about exception, you need to do nothing. walkthrough of hello world http server with erlang, cowboy, and rebar3 instead of returning the hello world, we're going to return the sum of two query parameter a, b. but what if the caller want to deal with the error? but i want to deal the the error. we have to use the patter match for the conditional execution. use try expression's of section to pattern match the error value. another type of error is although the query paramters are present, it has a string that cannot be parsed as an integer. putting it all togather, it's very verbose to handle errors in erlang. the erlang has three class of exception: error, exit, and throw. the simplest code that assume no error will be like this. but if you care, that is, you want to run some code on the condition of exception, things get verbose. catch exprs catch expression evaluate exprs and return its value on no exception. for exceptions of class throw, that is the code called throw term , term is returned. my guess is to keep the backward compatibility. it's too verbose and ugly but i think alternatives are worse. we can do condional branching with either case expression or function pattern match. it can be done by case expression or function. {PARAGRAPH}{INSERTKEYS}so hopefully, the higher framework catch these exceptions and restart the process. erlang has exception like many other langauges. well, it's not bad. whichever you use, it became quite verbose and boilar-plate. let's quickly borrow a code from the hello world http server i explained in the previous article. suppose, the users forget the query parameters. you can use try expression or catch expression try expression is strightforward, if you ignore the awkward erlang grammer that is. the catch expression.