I have created a Microsoft Bot inheriting TeamsActivityHandler for Messaging Extension in Teams in dotnetcore.
Inside the OnTeamsMessagingExtensionFetchTaskAsync method, I am trying to call a secure API that is hosted locally using HttpClient. I am calling this to populate a choiceSet in my Adaptive Card that will be invoked.
I am getting error in Teams UI whenever I try to invoke a messaging extension,
"Unable to reach app" - 502 error code
This secure api is an async method. As I couldn't debug the bot code, I couldn't figure out the exact error or what am I missing in some articles, I can see the example for unsecure Api's but nothing much regarding Secure APIs.
Can anyone please suggest an approach?
I am trying to implement Docusign in my application for digital signature. I am using .net core 2.0 for development purpose. I found that the Docusign SDK(https://www.nuget.org/packages/DocuSign.eSign.dll/) is not compatible with .net core so I tried with the other one (https://www.nuget.org/packages/DocuSign.Core). The general signature request is working fine but when it comes to Embedded Signing, there is no method available in the SDK(but is available in the original SDK). I am using REST API to complete Embedded signing process and is working fine for now.
Now I want to keep track the status of the document(like when it is delivered, when it is signed by signers and so on). I am configuring webhook to accomplish this task but not getting the webhook object in the webhook endpoint. I referred few documents ("https://github.com/docusign/recipe-010-webhook-csharp/blob/master/Webhook/Controllers/WebhookController.cs", "https://developers.docusign.com/esign-rest-api/code-examples/webhook-status",
"https://www.docusign.com/blog/dsdev-msbuild2018-session-thr2605/") to see how a webhook works but looks like none of them is working. In the examples, everyone is getting the webhook object inside request content(request.Content.ReadAsStreamAsync()) but I am getting null at Content.
Can someone help me out to resolve this issue. A sample code or helpful documents(apart from the one I am referring) would be great.
Thank you.
Re: .Net Core SDK support -- we hear you and we're working on it.
Re: webhook setup --
How are you creating the webhook subscription? Via the Administration tool or via the eventNotification object in the Envelopes::create call?
To get going, I'd suggest using the Administration tool. Use the Connect screen to add a webhook notification subscription to your server (your "listener"). Then you'll receive notifications for the events you've indicated an interest in.
Your server must support https and be available on the public internet so DocuSign can send POST requests to it.
Currently i working on Creating WCF service in order to communicate xamarin forms (Android) with sqlserver. For that i have tried some examples from the following link https://developer.xamarin.com/guides/xamarin-forms/web-services/consuming/wcf/ but it was not working also it throws error(SystemError).
My goal : i have to retrieve data from sqlserver using WCF service . Kindly provide ideas to solve this issues.
Thanks.
krupa
i think you want to create web-service, you can learn how to make wcf from here
webservices is same like an other client-server architecture where you send request to server and get response.
now make one hello world webservices base on above example
Request - in request you have to send data you can use xml or json
in method of webservice you have to process your data [calculate/store in DB/etc]
in response you send response data back
*to test a webservice use postman extension in chrome browser
I have a question about enabling cross-domain calls.
I have a WCF Rest service that is hosted in xyz domain. I am able to test these REST APIs from Advanced Rest Client, Postman and Fiddler. I also have a WPF application that actively calls these API which is hosted in a different domain (say abc domain) which works fine in getting responses.
However, when I created a new Angular web application and a Windows Service (deployed on abc domain), and tried calling the APIs from these two components, I am getting a 405 error.
Can someone explain:
How REST clients always are able to successfully establish a connection?
How does my WPF successfully connects to the WCF service even though
its on a different domain?
Why is my Windows Service/Web App not able to talk to WCF?
I assume that the issue here is caused by the preflight request. The browser issues this OPTIONS verb request to ask the server if the origin is allowed to call the API in a non-safe manner.
If your WCF REST service does not deal with this request, the WCF runtime will try to dispatch the request to your service implementation.
However, if the runtime does not find a method to call for this verb, it will return a 405 Method Not Allowed response.
I've dealt with this in the past by using an IOperationInvoker implementation, installed via an IOperationBehavior. This article describes a slightly different way of doing basically the same.
This is really basic.I want to implement a RESTful web API.
Now I know you can write custom applications and scripts to integrate with the API.
What I need to know:
In what languages can you write this API? C#, Java, php?
When building/programming a program that implements this API, is this the client and the software that issued the API the server? (eg. Dropbox would be the server and the custom app that integrates with the Dropbox API is the Client?
Thank you.
A REST API can be built in any programming language that allows you to handle HTTP requests (or can be attached to a Web server as a handler for requests). The two methods I've been using:
Stand-alone Windows service implementing a REST service using WCF
WEB server Apache + PHP
You are correct about the terminology. A program consuming a service is called the client, a program providing a service is called the server (while actually in the PHP approach, Apache would be the server as it is taking the request and having the script handle it).
Additional nitpicking: JQuery is not a language, but a framework to help you use some JavaScript features more easily.
On your comment Recap:
Close :-) The Client transfers JSON/XML/whatever to a server using HTTP requests. The Client can be written in any language that can perform HTTP requests.
On the server side, there needs to be some application that handles the HTTP requests (service), also written in any language, as long as it "speaks" HTTP.
The API is the definition of which operations are possible, for example, adding user accounts, getting the current time, etc. (this is what you define - what do you want your service to do?).
The JSON/XML/whatever that you transfer is the workload, the parameters for the API call. For example, if you want to add a new user to your system, the workload could be the new user name, the real name, the eMail address and some other details about the user. If the API call returns the current server time, you might not need any parameters at all, but you get back JSON/XML/whatever from the service.
The actual call being made is determined by the URL you call. For example, the URL for adding a user could be http://localhost/myrestservice/adduser and you'd perform a POST request against that URL with the required workload. For the time example, the URL could be http://localhost/myrestservice/getservertime and you'd perform a GET request against that URL.
I suggest that you read about how REST services actually work before you start, as I see some question marks on your face ;-)
Short:
API = available operations (=> URLs)
Parameters to API calls = JSON/XML/Plain Text/whatever
Client = calls the service through HTTP
Service = handles the calls, replies to client in response to HTTP requests
If you are a php programmer and familiar with Codeigniter framework then go here : Working with RESTful Services in CodeIgniter.
visit also : Rest Tutorial
First of all, you should begin with learning what is a RESTful API.
http://en.wikipedia.org/wiki/Representational_state_transfer
http://www.restapitutorial.com/
http://rest.elkstein.org/
In what languages can you write this API? C#, Java, php, jQuery?
You can write an API in any language. What can help is the framework you'd be using. JQuery is not a language, but a framework for integrating Javascript application in every web browser, so it won't help.
I'd advice you to use a microframework to write your first RESTful API, because they usually are easy to use and help focus on the important (bottle/flask in python, express in javascript, silex in php, spark in java or nina in C#)
When building/programming a program that implements this API, is this the client and the software that issued the API the server? (eg. Dropbox would be the server and the custom app that integrates with the Dropbox API is the Client?
You're right, the server is providing you the service, hence the API. The client is user to that API, and implementing it into something useful.
As most of the people stated already, you can do this in just about any language.
Might I suggest that you look into NodeJS? If so, check out Restify: http://mcavage.github.io/node-restify/
There's a nice community behind NodeJS and I think it's quite open to newcomers. Just try not to pick up bad habits from JavaScript pitfalls. If you're new to programming, I'd suggest reading some intro book.
good luck!