Develop Reference

HTTP Request from Web to Android

How can I make an HTTP request from a web application (like node js) to an android app?
The goal is to read if the response is a success, for example, from Web to Web I make an HTTP request to the IP/URL and, if it returns 200, I have success. It would work as a "ping" to check if the android app is "alive".
Note: I don't know apps architecture
Thanks!

Using web sockets ( example here: https://www.html5rocks.com/en/tutorials/websockets/basics/ ) will help u to achieve it

Res.redirect() vs res. Json(). Server for web and mobile

I am new to web development. I had a web project with EJS templating. It redirects directly from the server. Using res.redirect() . I want to create a server for web and mobile both.
Question is... When i use res.json() it sends JSON data to client side. Can work for both.
It is possible to use res.redirect() for both. Web and mobile.
Pros and cons of res.rediret and res.json
Please explain. I appreciate your suggestions in adv. Thanks.

It is possible to use res.redirect() for both. Web and mobile.
If you mean can you use res.redirect() as an alternative to res.json() then the answer is NO. res.redirect() is not an alternative to res.json. res.redirect() only sends a code and a URL back to the client, there is no data in the response. You will still need to use res.json or res.send to get the data you need. Every time you use res.redirect() you are sending a response to the client telling them to make a brand new request to another location. You're not sending any real data. The android app will not get any content till you use res.json or res.send. Redirects just tell the client go get the data from somewhere else.
Below are example responses to an android app when the server uses res.json and res.redirect
res.redirect("/user")
//Response to Android app
302 /user
The response above means what you want is located at "/user" so the mobile app will need to make a request to
res.json(user)
//Response to Android app
{
name: "Arpit Yadav",
phone: 555-555
}

res.redirect sends status code 302 (if not specified), and location (route) to browser, after which browser redirects the request to the specified location, whereas res.json sets Content-Type: application/json and sends data to the browser.
Redirection is generally meant for browser only, but, you can use it for mobile. In that case, you have to handle the logic to re-request with updated location received from server that is not recommended.
In nutshell, both have different purpose. res.redirect to move clients to different route and res.json to actually sends the data.

Android call my own LOCAL WebService (Symfony) in localhost

i have build an app on Symfony and a WebService REST for this app.
I have already build an Android application on the same idea of my Symfony project and i want to use the API (I'm on localhost) of my Symfony Application for consuming my Webservice in Android.
How can I do that without an OVH server or something else ?
Thank you ;)

You just need to send HTTP request to your webservice by specifing the endpoint as your local IP address.
You can use a third-part library as https://github.com/square/retrofit to do that properly, or with the native android http request manager : https://developer.android.com/reference/java/net/HttpURLConnection.html

HTTP request to the Authorization server using TLS Android

I am new the android programming,I want to integrate the mixit social network in my app like facebook.To integrate the mixit I have to get the authorization request using Http connection using TLS.but I dont know how to write code for HTTP TLS connection.So please give me any guidance to proceed further.
Thanks in advance

Android: How to periodically send location to a django server with csrf verification

I want my android app to periodically send location information to my django server.
Based on my research, android client should write the location in JSON, payload JSON in http post, and send http post request to django server periodically. and the http post request is created by the client directly, not from a post form by django. Is it a normal way?
If posting data without form is a general way, then to stop csrf verification, according to the answer of Android sending post requests to django server csrf failing, the android client should
"getting the token from the server and sending that along with the POST data "
(suppose I do not use solution of #csrf_exempt)
My question is where to get the csrftoken cookie?
I do see csrftoken cookie if I send a GET request to a post form, but if posting data directly (without asking for the post form), where does a client get the csrftoken cookie?

You could use an API like tastypie or rest-framework. The only way to get the token is by accessing the page that gives it.