978: remove spring-web

Ticket: planning#978 (closed)

• removed dependency
• added OkHttpClient
• created intermediate client to abstract between logic and HTTP handling
• adjusted and extended tests

core/src/main/java/dev/fitko/fitconnect/core/http/HttpClient.java

@@ -49,8 +49,14 @@ public class HttpClient {
     }
 
     public HttpClient(boolean throwExceptionsOnFailure, List<Interceptor> interceptors, Proxy proxy) {
-        LOGGER.info("Creating HttpClient with proxy configuration: {}", proxy);
-        this.httpClient = builderWithInterceptors(interceptors).proxy(proxy).build();
+
+        if (proxy.address().toString().equals("localhost/127.0.0.1:0")) {
+            LOGGER.info("Creating HttpClient without proxy configuration.");
+            this.httpClient = builderWithInterceptors(interceptors).build();
+        } else {
+            LOGGER.info("Creating HttpClient with proxy configuration: {}", proxy);
+            this.httpClient = builderWithInterceptors(interceptors).proxy(proxy).build();
+        }
         this.throwExceptionsOnFailure = throwExceptionsOnFailure;
     }