Skip to main content

Owin component : Modifying owin response


Writing Owin component is really easy. Changing response's body content can be tricky.

Let's say you need to strip out confidential information from your http/https response before passing it to the client. Sounds pretty easy but tricky at the same time.

Key points to note is that :-

1. Must invoke the next owin component in the pipeline before reading response as string. (maybe that's obvious)

Try to use filter to control flow to your owin component. As you can see below, code 21, i running a check on Request.Path to prevent application to flow through (modifying anything in my Owin component).

2.When modifying content, you need to set context.Response.ContentType, StatusCode and ContentLength to the size of data you're trying to push across.

I used memorystream to channel my output to context.response.body

3. Must use code starting from Line 69 to copy content to context.Response.Body. Your owin pipeline can get pretty unable if you don't do this.

Full source for my implementation is given here.







Comments

Popular posts from this blog

Android Programmatically apply style to your view

Applying style to your view (button in this case) dynamically is pretty easy. All you have to do is place the following in your layout folder (res/layout)
Let's call this file : buttonstyle.xml
<?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:state_pressed="true" > <shape> <solid android:color="#449def" /> <stroke android:width="1dp" android:color="#2f6699" /> <corners android:radius="3dp" /> <padding android:left="10dp" android:top="10dp" android:right="10dp" android:bottom="10dp" /> </shape> </item> <item> <shape> <gradient android:startColor="#449def" a…

OpenCover code coverage for .Net Core

I know there are many post out there getting code coverage for .dotnetcore. I'm using opencover to address this needs.

In case, you do no want to use opencover and wanted to stick with vs2015 code coverage, you can try to copy Microsoft.VisualStudio.CodeCoverage.Shim.dll from C:\Program Files (x86)\Microsoft Visual Studio 14.0\Team Tools\Dynamic Code Coverage Tools\coreclr\ and drop it into your project "bin\Debug\netcoreapp1.0" folder.  Please note : you need to be on VS2015 Enterprise to do this. 

To get started, I guess we need to add OpenCover and ReportGenerator for our test projects, as shown in diagram below :-



When nuget packge gets restored, we will have some binaries downloaded to our machine and we going to use this to generate some statistics. I think the biggest issue is to getting those command lines work.

In dotnetcore, we run test project using "dotnet test" (assuming you are in the test project folder - if not please go there)  So we add this …

DataTable does not have AsEnumerable

I have problem locating my AsEnumerable extension method in my DataTabe (System.Data). Thank god for this post by Angel
(http://blogs.msdn.com/angelsb/archive/2007/02/23/does-not-contain-a-definition-for.aspx)

I was able to find this method once i have added reference to the following assembly.

C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.5\System.Data.DataSetExtensions.dll

Try to do a dummy Build and you should be able to get it.