Revert "feat(tls): allow disabling protocol upgrade (#1409)" (#1414)

This reverts commit edc79d8.

src/main/java/com/adyen/Config.java

@@ -17,7 +17,6 @@ public class Config {
     protected String apiKey;
     protected int connectionTimeoutMillis;
     protected int readTimeoutMillis;
-    protected Boolean protocolUpgradeEnabled;
 
     //Terminal API Specific
     protected String terminalApiCloudEndpoint;
@@ -102,18 +101,6 @@ public void setReadTimeoutMillis(int readTimeoutMillis) {
         this.readTimeoutMillis = readTimeoutMillis;
     }
 
-    public Boolean getProtocolUpgradeEnabled() {
-        return protocolUpgradeEnabled;
-    }
-
-    /**
-     * Whether the HTTP requests should automatically attempt to upgrade to a safer/newer version of the protocol.
-     * See also {@link RequestConfig.Builder#setProtocolUpgradeEnabled(boolean)}.
-     */
-    public void setProtocolUpgradeEnabled(Boolean protocolUpgradeEnabled) {
-        this.protocolUpgradeEnabled = protocolUpgradeEnabled;
-    }
-
     public String getLiveEndpointUrlPrefix() {
         return this.liveEndpointUrlPrefix;
     }

src/main/java/com/adyen/httpclient/AdyenHttpClient.java

@@ -121,9 +121,6 @@ private HttpUriRequestBase createRequest(String endpoint, String requestBody, Co
         if (config.getConnectionTimeoutMillis() > 0) {
             builder.setConnectTimeout(config.getConnectionTimeoutMillis(), TimeUnit.MILLISECONDS);
         }
-        if (config.getProtocolUpgradeEnabled() != null) {
-            builder.setProtocolUpgradeEnabled(config.getProtocolUpgradeEnabled());
-        }
         if (proxy != null && proxy.address() instanceof InetSocketAddress) {
             InetSocketAddress inetSocketAddress = (InetSocketAddress) proxy.address();
             builder.setProxy(new HttpHost(inetSocketAddress.getHostName(), inetSocketAddress.getPort()));