Outputs

• if the return value is string then it will send that string as the response's body.
• If it's an int then it will send it as a status code.
• If it's an error then it will set a bad request with that error as its reason.
• If it's an error and an int then the error code is the output integer instead of 400(bad request).
• If it's a custom struct then it sent as a JSON, when a Content-Type header is not already set.
• If it's a custom struct and a string then the second output value, string, it will be the Content-Type and so on.

Type	Replies to
string	body
string, string	content-type, body
string, int	body, status code
int	status code
int, string	status code, body
error	if not nil, bad request
any, bool	if false then fires not found
<Τ>	JSON body
<Τ>, string	body, content-type
<Τ>, error	JSON body or bad request
<Τ>, int	JSON body, status code
Result	calls its Dispatch method
PreflightResult	calls its Preflight method

Where <T> means any struct value.