Application.Current.UseAPI which has three overloads corresponding to the different types of middleware listed above. The registration is usually done at the entry point of the application and can look something like this:
Response. If a
Responsewas returned from the request filter, then this response is returned to the client without calling the handler. If none of the filters returned a
Responseobject, then the request will be passed on and dealt with by the handler.
Responseobject if that's the case. This means that the request will be blocked without reaching the handler. Otherwise, it returns
nulland allows the request to move on to the next request filter or go to the handler if there was only one request filter.
true. Like this:
/specialURI prefix after the request has been dealt with by the handler:
/special. It would then return the response and no other response filters would be called. If the request URI did not start with
/special, then the next response filter would be called or the response would be returned if there were no more response filters to call. Take a look at this response filter by comparison:
404page by checking the outgoing responses for the
404status code and return a response containing the "not found" HTML page.
true. Like this:
/Testhandler, the request filter will intercept it and create a
Responseobject. This response is then intercepted by the response filter that creates another
Responseobject which will be the one received by the client. When this code runs, "THIS IS FROM THE RESPONSE FILTER" displays.
ifstatement fixes it:
Application.Current.Usealso allows for exposing custom middleware classes. These middleware classes implement the
IMiddlewareinterface to create a custom middleware class. The middleware created is a request filter that returns an unhelpful response no matter what the incoming request is.
HtmlFromJsonProvideris a custom middleware class provided by Starcounter. It acts as a response filter by intercepting outgoing responses containing JSON objects and instead responding with the corresponding HTML. For example, look at the following application:
/person, this is what will happen:
HtmlFromJsonProviderintercepts the object
Htmlproperty and finds
HtmlFromJsonProviderwill throw this exception:
Htmlproperty and don't intend to return HTML, but to return the JSON instead, set
<!DOCTYPE html>. If it's not a full HTML document, it wraps the existing HTML inside the body of an HTML document that contains the following:
palindrom-clientelement to create a WebSocket connection
PartialToStandaloneHtmlProviderwraps the actual response from the handler, it will have the HTTP status code of the response.