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I try to use a api with OAuth2. With Postman it works. But now i I try to write this in Java. I don't have spring boot, it is a simple Maven project The only example I found was this

Example okhttp

But it seems it only works with base authenticaton. It is strange I find only Android examples, and no Java examples

My question is, is it possible to do a Oauth2 with okhttp? Or is it the wrong library?

I am new to kotlin, so I am sorry in advance, if this is a simple misstake.

I am trying at the moment to rewrite an api (written in Kotlin) to java 17. Everything worked so far. But now I am getting following deprecated message:

'toLowerCase(): String' is deprecated. Use lowercase() instead.

Of course I know what it means, so I tried doing it like in the following Picture: https://i.stack.imgur.com/vT8k5.png

But why doesnt it find the lowercase Function?

This is in my build.gradle:

I am migrating a project to a new API and thus have to update the deserialization and data classes. Using the old API and data classes everything works fine, but using the updated version I get the following error

I'm using OkHttp library in my java application. I have a class that makes requests and uses OkHttpClient class, which is then used in other 2 classes.

Retrofit: I want to use Tag annotation to pass some data in the request, and then I would like to intercept that data from the interceptor.

Something like this

How can I use it something like this, but without using Call

I am using fused location api to find the current location in the fragment, sometimes getting a memory leak

How to fix this issue?

Java is a beautiful language, and is also supposedly very efficient. Coming from a background of having used Python, I wanted to see the difference between the 2 languages- and from the start I was very impressed by the explicitness and clarity of Java's OOP based syntax. However, I also wanted to test out the performance differences between the languages.

I started off by trying to test the performance difference between the 2 languages by computation speed. For this, I wrote some code in each language- the program attempted to calculate a mathematical problem, and would iterate many times. I won't be adding this code here, but I will say the results- Python was almost 2 times slower (measured by time) than Java. Interesting, but it was expected. After all, the whole reason I wanted to try using Java is due to the amount of people bragging about the computation speed.

Following that, I proceeded to my second test- making HTTP connections to websites, in order to download web pages. For this test, I wrote another test program which would do the same as the last test, except instead of computing a math equation, it would download a web page using an HTTP library.

I ended up writing the following script in Python. It is very straightforward, it iterates 10 times over downloading a web page, then prints the average.

As per https://square.github.io/okhttp/3.x/okhttp/ , I think preemptive authentication can happen only if we have proxy server.

We have one resource/origin server which authorises clients with Oauth tokens.

We have implemented authorisation OkHttp Authenticator https://square.github.io/okhttp/3.x/okhttp/okhttp3/Authenticator.html . However, the client always makes a request without authorisation headers and then adds it. Can we use authenticator and still supply authorisation header to our resource server in a single request ? We can predict the challenge. However, not sure if it's possible to avoid a request to server without authorisation headers.

We are able to use the interceptor to add headers preemptively.

Is it possible to use Authenticator and add headers preemptively without a proxy server?

I understand that this is how the interceptor works and a request from the application passes through the OkHttp core, via retrofit wrapper and OkHttpp core call to make an actual network request and the network response to the application interceptor response via the retrofit wrapper.

Is there a way to avoid calling the actual request from the application interceptor, as in, in some scenario in application interceptor check if the request URL is some string, then, in that case, do-not-call the actual network request and directly return the hard-coded response from the application interceptor?