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