API OAuth Token Access-Control-Allow-Credentials header is empty

When implementing an Azure API App using MVC Web API with OAuth Bearer Token Authorization, we came across this error: Response to preflight request doesn't pass access control check: Credentials flag is 'true', but the 'Access-Control-Allow-Credentials' header is ''. It must be 'true' to allow credentials. Origin 'http://domain.com' is therefore not allowed access. This...

404 Error axd HTTP Handler

This error is common when a previously working web app has been migrated to another server or a cloud hosted environment, and it is now showing the HTTP 404 (Not Found) error.  To figure out the root cause and solution, let’s take a look at how the web app was configured initially. We will then take a look at the solution. HTTP Handlers Configuration When we look at the web.config settings...

Publish MVC Web App on Azure Virtual Directory

Azure Web Apps are deployed as a new website on the Azure cloud. For those who have control of the server, this is similar to adding a new website on an IIS server. What if we need to deploy another web app on Azure, but we do not want to create a new web site?  Well the answer is to create a...

SharePoint App List Lookup Delete Behavior

A SharePoint list can have a field type lookup which is a reference to another list. As an example, we have a client and project lists. The project list has a client lookup field which as reference uses the client list. As in any application, we need referential integrity, and we need to prevent the...

AngularJS Minimized File Unknown Provider

We have a working AngularJS single page application (SPA), but the moment we minimized the JS files, the app breaks with an Unknown Provider error. When facing this problem, we need to look at how we are injecting dependencies into our modules because when minimizing the files, the parameters name will be changed and Angular would not be able to resolve the dependency. Implicit (bad) Injection...

SharePoint 2013 API OData For Lookup Fields

When using SharePoint data lists as the backend for an application, we can leverage the use of REST and OData to fetch the information from a data list. When the list contains lookup fields, a normal GET operation on the list only returns the id from the lookup field which may not be enough for...