fix: #171 Add --http2PriorKnowledge argument to be able to connect to h2 endpoints over http

Author: en-milie

src/main/java/com/endava/cats/args/ProcessingArguments.java

@@ -112,6 +112,11 @@ public class ProcessingArguments {
     private boolean resolveXxxOfCombinationForResponses;
 
 
+    @CommandLine.Option(names = {"--http2PriorKnowledge"},
+            description = "If set to @|bold true|@, it will force a http2 connection, without fallback to HTTP 1.X . Default: @|bold,underline ${DEFAULT-VALUE}|@")
+    private boolean http2PriorKnowledge;
+
+
     /**
      * Checks if the payload matches any of the supplied --oneOfSelection or --anyOfSelection argument
      *

src/main/java/com/endava/cats/io/ServiceCaller.java

@@ -38,6 +38,7 @@
 import okhttp3.HttpUrl;
 import okhttp3.MediaType;
 import okhttp3.OkHttpClient;
+import okhttp3.Protocol;
 import okhttp3.Request;
 import okhttp3.RequestBody;
 import okhttp3.Response;
@@ -148,6 +149,7 @@ public void initHttpClient() {
                     .connectionPool(new ConnectionPool(10, 15, TimeUnit.MINUTES))
                     .sslSocketFactory(sslSocketFactory, (X509TrustManager) trustAllCerts[0])
                     .retryOnConnectionFailure(true)
+                    .protocols(processingArguments.isHttp2PriorKnowledge() ? List.of(Protocol.H2_PRIOR_KNOWLEDGE) : List.of(Protocol.HTTP_2, Protocol.HTTP_1_1))
                     .hostnameVerifier((hostname, session) -> true).build();
 
             logger.debug("Proxy configuration to be used: {}", authArguments.getProxy());

src/main/java/com/endava/cats/model/CatsTestCase.java

@@ -32,7 +32,9 @@ public class CatsTestCase {
                  %s \\
                   %s
             """;
-    private static final String CURL_HEADER = " -H \"%s: %s\"";
+    private static final String CURL_HEADER = """
+            -H "%s: %s" \\
+            """;
     private static final String CURL_BODY = " -d '%s'";
 
     private static final String CATS_REPLAY = "cats replay %s";