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openrasta

OpenRasta - Encoding Errors as JSON rather than HTML

I notice OpenRasta.Core has an HtmlErrorCodec which is responsible for rendering a the server error page sent out when a handler throws an Exception.

When I make an JSON Ajax request to an exception throwing handler this Codec is selected and the exception is rendered as HTML.

I have tried to register my own IMediaTypeWriter for IList<Error> with MediaType("application/json") so I can send back JSON to the browser, but it seems to be ignored. Can anyone help?

Thanks Neil

Solution

  • If there is an error, indeed a codec with IList will be selected, but will follow the normal conneg for a type.

    I'd suggest having a look at the request log and finding out how and why the html codec gets selected (I'd suspect with my remote debugging tunnel vision that you may have a browser sending the equivalent of Accept: text/html,application/json, at which point OR doesn't really know which of the two is acceptable, which is probably a bug as we register text/html with a q of 1 where it should be 0.5). If that's indeed what the problem is, the solution is to remove the registration for the html error codec, which you can do by providing your own DependencyRegistrar.