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Windows.Web.UI.Interop.WebViewControl localhost access

2018 Jul 25, 5:34

If you're developing with the new Windows.Web.UI.Interop.WebViewControl you may have noticed you cannot navigate to localhost HTTP servers. This is because the WebViewControl's WebView process is a UWP process. All UWP processes by default cannot use the loopback adapter as a security precaution. For development purposes you can allow localhost access using the checknetisolation command line tool on the WebViewControl's package just as you can for any other UWP app. The command should be the following:

checknetisolation loopbackexempt -a -n=Microsoft.Win32WebViewHost_cw5n1h2txyewy

As a warning checknetisolation is not good on errors. If you attempt to add a package but get its package family name wrong, checknetisolation just says OK:

C:\Users\davris>checknetisolation LoopbackExempt -a -n=Microsoft.BingWeather_4.21.2492.0_x86__8wekyb3d8bbwe
OK.
And if you then list the result of the add with the bad name you'll see the following:
[1] -----------------------------------------------------------------
Name: AppContainer NOT FOUND
SID: S-1-15-...

There's also a UI tool for modifying loopback exemption for packages available on GitHub and also one available with Fiddler.

As an additional note, I mentioned above you can try this for development. Do not do this in shipping products as this turns off the security protection for any consumer of the WebViewControl.

PermalinkCommentschecknetisolation loopback security uwp webview win32webview

Tweet from David Risney

2016 Sep 8, 3:07
According to Bing's definition of sandwich, a hotdog is not a sandwich.
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Tweet from David Risney

2016 Sep 8, 3:07
If I ask Bing to 'define sandwich' it says 'a town in southeastern Massachusetts, on Cape Cod...' https://www.bing.com/search?q=define%20sandwich 
PermalinkComments

Retweet of FakeUnicode

2016 Jan 10, 10:34
Support! Rather than "Combining" though they would be "Combing." https://twitter.com/martineno/status/686639564207841281 … [@martineno]
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Tweet from David_Risney

2015 Aug 13, 4:02
Watch GTA5 player's game get hacked by back rubbing, multiplying, exploding troll. https://www.youtube.com/watch?v=LMUe7qMxM1s …
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NOAA FAQ - "Why don't we try to destroy tropical cyclones by nuking them?"

2012 Nov 5, 5:28

This sounds like an Onion article but is actually a real article on NOAA’s website describing why we can’t use nukes to destroy tropical storms. This in the frequently asked questions.

PermalinkCommentshumor storm nuke noaa

Why aren’t my kids hyper after binging on sugar?

2012 Oct 1, 8:23

“A particularly troublesome finding was that for some children, if they were told that sugar would make them hyper, then they actually would become hyper after thinking that they had eaten sugar.”

PermalinkCommentsscience sugar parent

Reddit explains Obamacare

2012 Jul 1, 5:16

PPACA (aka Obamacare) broken down into its main subsections with brief explinations and citations linking into the actual PPACA document (why is it always PDF?).

Its interesting to see the very small number of parts folks are complaining about versus the rest which mostly strikes me as “how could this not already be the case?”

I’m no expert, and everything I posted here I attribute mostly to Wikipedia or the actual bill itself, with an occasional Google search to clarify stuff. I am absolutely not a difinitive source or expert. I was just trying to simplify things as best I can without dumbing them down. I’m glad that many of you found this helpful.”

PermalinkCommentshealth-care politics PPACA obama obamacare law legal

ifc: This week on Comedy Bang! Bang! - Michael Cera!

2012 Jun 27, 3:38


ifc:

This week on Comedy Bang! Bang! - Michael Cera!

PermalinkCommentshumor comedy-bang-bang michael-cera video

Another Comedy Bang Bang preview clip this time with Zach...

2012 Apr 18, 6:02


Another Comedy Bang Bang preview clip this time with Zach Galifianakis.

PermalinkCommentszach-galifianakis comedy-bang-bang video humor preview scott-aukerman tv clip

Color Thief, script for grabbing the color palette from an image (lokeshdhakar.com)

2012 Jan 7, 6:42

Picks out dominant color or palette from an image. Not only is that cool, but it is in JavaScript using canvas, and is licensed under Creative Commons attribution.

PermalinkCommentstechnical color javascript canvas library

"JSON Patch" - Paul Bryan

2011 Nov 17, 1:06

Mime-type for describing the difference between two JSON resources (in JSON using JSON paths)

PermalinkCommentstechnical mime mime-type json ietf

pbryan-json-patch - A JSON Media Type for Describing Partial Modifications to JSON Documents

2011 Apr 20, 2:27"JSON (JavaScript Object Notation) Patch defines the media type "application/patch+json", a JSON-based document structure for specifying partial modifications to apply to a JSON document."PermalinkCommentsjson reference patch mime mimetype technical

Powershell to test your XPath

2011 Apr 14, 5:11This page and esp. the final comment on the page were very helpful with describing how to parse XML in PowerShell.PermalinkCommentspowershell xml xpath technical programming

JavaScript & .NET interop via WebBrowser Control

2011 Apr 5, 10:00

For my GeolocMock weekend project I intended to use the Bing Maps API to display a map in a WebBrowser control and allow the user to interact with that to select a location to be consumed by my application. Getting my .NET code to talk to the JavaScript in the WebBrowser control was surprisingly easy.

To have .NET execute JavaScript code you can use the InvokeScript method passing the name of the JavaScript function to execute and an object array of parameters to pass:

this.webBrowser2.Document.InvokeScript("onLocationStateChanged",
new object[] {
latitudeTextBoxText,
longitudeTextBoxText,
altitudeTextBoxText,
uncertaintyTextBoxText
});

The other direction, having JavaScript call into .NET is slightly more complicated but still pretty easy as far as language interop goes. The first step is to mark your assembly as ComVisible so that it can interact with JavaScript via COM. VS had already added a ComVisible declaration to my project I just had to change the value to true.

[assembly: ComVisible(true)]

Next set ObjectForScripting attribute to the object you want to expose to JavaScript.

this.webBrowser2.ObjectForScripting = this.locationState;

Now that object is exposed as window.external in JavaScript and you can call methods on it.

window.external.Set(lat, long, alt, gUncert);

However you don't seem to be able to test for the existence of methods off of it. For example the following JavaScript generates an exception for me even though I have a Set method:

if (window.external && window.external.Set) {
PermalinkCommentsjavascript webbrowser .net technical csharp

GeolocMock Tool - Tell IE9 Where You Are

2011 Apr 3, 12:00

I've made GeolocMock. If your PC has no geolocation devices, IE9 uses a webservice to determine your location. GeolocMock uses FiddlerCore to intercept the response from the webservice and allows the user to replace the location in the response with another. This was a fun weekend project in order to play with FiddlerCore, the W3C Geoloc APIs in IE9, hosting the IE9 WebOC in a .NET app, and the Bing Maps APIs.

PermalinkCommentsfiddler technical geoloc ie9 fiddlercore

Bing - New Bing Maps Application: Streetside Photos - Bing Maps Blog - Bing Community

2010 Feb 19, 3:20Bing Maps blog post on their integration of Flickr photos onto their street side view. Very coolPermalinkCommentsflickr photo creativecommons geolocation bing microsoft photography map blog geo

Bill Gates on energy: Innovating to zero! | Video on TED.com

2010 Feb 18, 4:59"At TED2010, Bill Gates unveils his vision for the world's energy future, describing the need for "miracles" to avoid planetary catastrophe and explaining why he's backing a dramatically different type of nuclear reactor."PermalinkCommentsted bill-gates video environment energy

Blaise Aguera y Arcas demos augmented-reality maps | Video on TED.com

2010 Feb 18, 4:57Bing Maps TED talk demos integration of various things including photosynth, flickr photos, and live video.PermalinkCommentsvideo microsoft map flickr 3d photosynth bing augmented-reality

WPAD Server Fiddler Extension

2010 Jan 5, 7:42

I've made a WPAD server Fiddler extension and in a fit of creativity I've named it: WPAD Server Fiddler Extension.

Of course you know about Fiddler, Eric's awesome HTTP debugger tool, the HTTP proxy that lets you inspect, visualize and modify the HTTP traffic that flows through it. And on the subject you've probably definitely heard of WPAD, the Web Proxy Auto Discovery protocol that allows web browsers like IE to use DHCP or DNS to automatically discover HTTP proxies on their network. While working on a particularly nasty WPAD bug towards the end of IE8 I really wished I had a way to see the WPAD requests and responses and modify PAC responses in Fiddler. Well the wishes of me of the past are now fulfilled by present day me as this Fiddler extension will respond to WPAD DHCP requests telling those clients (by default) that Fiddler is their proxy.

When I started working on this project I didn't really understand how DHCP worked especially with respect to WPAD. I won't bore you with my misconceptions: it works by having your one DHCP server on your network respond to regular DHCP requests as well as WPAD DHCP requests. And Windows I've found runs a DHCP client service (you can start/stop it via Start|Run|'services.msc', scroll to DHCP Client or via the command line with "net start/stop 'DHCP Client'") that caches DHCP server responses making it just slightly more difficult to test and debug my extension. If a Windows app uses the DHCP client APIs to ask for the WPAD option, this service will send out a DHCP request and take the first DHCP server response it gets. That means that if you're on a network with a DHCP server, my extension will be racing to respond to the client. If the DHCP server wins then the client ignores the WPAD response from my extension.

Various documents and tools I found useful while working on this:

PermalinkCommentsproxy fiddler http technical debug wpad pac tool dhcp
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