"servlet/helpers.ss" provides functions built on "servlet/web.ss" that are useful in many servlets.
uri : string?
Generates an HTTP response that redirects the browser to uri, while including the headers in the response.
v : any/c
Determines if v is one of the following values.
A redirection-status? for permanent redirections.
A redirection-status? for temporary redirections.
A redirection-status? for "see-other" redirections.
Calls thunk with an exception handler that generates an HTML error page and calls send/finish-or-back.