how do i access the elmah log when used in web api - asp.net-web-api

Question

I installed elmah as described here https://github.com/rdingwall/elmah-contrib-webapi
Now I am trying to access the logging but I keep getter error 404 errors.
Am I using the correct url ? Is there still some configuration missing ?
My webapi runs as follows :
http://localhost/MagnusREST/api/Customers/054036?frmt=xml
My application_start looks like this :
protected void Application_Start()
{
GlobalConfiguration.Configuration.Filters.Add(new ElmahHandleErrorApiAttribute()); //added for elmah
AreaRegistration.RegisterAllAreas();
UnityConfig.RegisterComponents();
GlobalConfiguration.Configure(WebApiConfig.Register);
FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
RouteConfig.RegisterRoutes(RouteTable.Routes);
BundleConfig.RegisterBundles(BundleTable.Bundles);
}
my webapi config remained unchanged and looks like this :
public static class WebApiConfig
{
public static void Register(HttpConfiguration config)
{
// Web API configuration and services
// Web API routes
config.MapHttpAttributeRoutes();
config.Routes.MapHttpRoute(
name: "DefaultApi",
routeTemplate: "api/{controller}/{id}",
defaults: new { id = RouteParameter.Optional }
);
config.Formatters.JsonFormatter.MediaTypeMappings.Add(
new QueryStringMapping("frmt", "json",
new MediaTypeHeaderValue("application/json")));
config.Formatters.XmlFormatter.MediaTypeMappings.Add(
new QueryStringMapping("frmt", "xml",
new MediaTypeHeaderValue("application/xml")));
//config.Formatters.Clear();
JsonMediaTypeFormatter oldformatter = config.Formatters.Where(f => f is JsonMediaTypeFormatter).FirstOrDefault() as JsonMediaTypeFormatter;
if (oldformatter != null) config.Formatters.Remove(oldformatter);
config.Formatters.Insert(0,new PartialJsonMediaTypeFormatter() { IgnoreCase = true });
}
}
Accessing logs via http://localhost/MagnusREST/api/elmah.axd does not work, via http://localhost/MagnusREST/elmah.axd does not work and http://localhost/elmah.axd does not work either.
What am I doing wrong?
This is running in visual studio 2013.

Answer 1

There was a missing piece in the web.config
<handlers>
<remove name="ExtensionlessUrlHandler-Integrated-4.0" />
<remove name="OPTIONSVerbHandler" />
<remove name="TRACEVerbHandler" />
<add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
<add name="elmah" verb="POST,GET,HEAD" path="elmah.axd" type="Elmah.ErrorLogPageFactory, Elmah" />
</handlers>
The elma handler needs to be added. After doing that I could access the elmah log using followin url :
http://localhost/MagnusREST/elmah.axd
You have to read the documentation and questions both for elmah and the webapi contrib it seems. Ok the first problem is passed, what will be the next ;-)
To get is fully working more is needed than the above
Add configsections
<configSections>
<sectionGroup name="elmah">
<section name="security" requirePermission="false" type="Elmah.SecuritySectionHandler, Elmah"/>
<section name="errorLog" requirePermission="false" type="Elmah.ErrorLogSectionHandler, Elmah" />
<section name="errorMail" requirePermission="false" type="Elmah.ErrorMailSectionHandler, Elmah" />
<section name="errorFilter" requirePermission="false" type="Elmah.ErrorFilterSectionHandler, Elmah"/>
</sectionGroup>
</configSections>
Add the elmah configuration you like for instance to send mails :
<elmah>
<security allowRemoteAccess="0" />
<errorMail from="xxxx" to="xxx" subject="some error" async="true"
smtpPort="25" smtpServer="xxx" userName="xxx" password="xxx"/>
</elmah>
The system.web and system.webserver need to be something like this :
<system.web>
<compilation debug="true" targetFramework="4.5.1" />
<httpRuntime targetFramework="4.5.1" />
<httpHandlers>
<add verb="POST,GET,HEAD" path="elmah.axd" type="Elmah.ErrorLogPageFactory, Elmah" />
</httpHandlers>
<httpModules>
<add name="ErrorLog" type="Elmah.ErrorLogModule, Elmah"/>
<add name="ErrorMail" type="Elmah.ErrorMailModule, Elmah"/>
</httpModules>
</system.web>
<system.webServer>
<validation validateIntegratedModeConfiguration="false"/>
<modules>
<add name="Elmah.ErrorLog" type="Elmah.ErrorLogModule, Elmah" preCondition="managedHandler" />
<add name="Elmah.ErrorMail" type="Elmah.ErrorMailModule" preCondition="managedHandler" />
</modules>
<handlers>
<remove name="ExtensionlessUrlHandler-Integrated-4.0" />
<remove name="OPTIONSVerbHandler" />
<remove name="TRACEVerbHandler" />
<add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
<add name="elmah" verb="POST,GET,HEAD" path="elmah.axd" type="Elmah.ErrorLogPageFactory, Elmah" />
</handlers>
</system.webServer>
Take a good look where elmah is being mentioned and add those things to your own configuration file that might look slightly different.

Answer 2

I also had to add this to my web.config and they it worked
<location path="elmah.axd" inheritInChildApplications="false">
<system.web>
<httpHandlers>
<add verb="POST,GET,HEAD" path="elmah.axd" type="Elmah.ErrorLogPageFactory, Elmah" />
</httpHandlers>
<!--
See http://code.google.com/p/elmah/wiki/SecuringErrorLogPages for
more information on using ASP.NET authorization securing ELMAH.
<authorization>
<allow roles="admin" />
<deny users="*" />
</authorization>
-->
</system.web>
<system.webServer>
<handlers>
<add name="ELMAH" verb="POST,GET,HEAD" path="elmah.axd" type="Elmah.ErrorLogPageFactory, Elmah" preCondition="integratedMode" />
</handlers>
</system.webServer>