Fix and more tests

Author: jandro996

dd-java-agent/appsec/src/main/java/com/datadog/appsec/gateway/AppSecRequestContext.java

@@ -163,7 +163,7 @@ public class AppSecRequestContext implements DataBundle, Closeable {
 
   private volatile boolean wafBlocked;
   private volatile String blockingResponseContentType;
-  private volatile int blockingResponseContentLength = -1;
+  private volatile Integer blockingResponseContentLength;
   private volatile boolean wafErrors;
   private volatile boolean wafTruncated;
   private volatile boolean wafRequestBlockFailure;
@@ -247,11 +247,11 @@ public String getBlockingResponseContentType() {
     return blockingResponseContentType;
   }
 
-  public void setBlockingResponseContentLength(int contentLength) {
+  public void setBlockingResponseContentLength(Integer contentLength) {
     this.blockingResponseContentLength = contentLength;
   }
 
-  public int getBlockingResponseContentLength() {
+  public Integer getBlockingResponseContentLength() {
     return blockingResponseContentLength;
   }
 

dd-java-agent/appsec/src/main/java/com/datadog/appsec/gateway/GatewayBridge.java

@@ -936,8 +936,8 @@ private NoopFlow onRequestEnded(RequestContext ctx_, IGSpanInfo spanInfo) {
       String blockingContentType = ctx.getBlockingResponseContentType();
       if (blockingContentType != null) {
         traceSeg.setTagTop("http.response.headers.content-type", blockingContentType);
-        int blockingContentLength = ctx.getBlockingResponseContentLength();
-        if (blockingContentLength >= 0) {
+        Integer blockingContentLength = ctx.getBlockingResponseContentLength();
+        if (blockingContentLength != null) {
           traceSeg.setTagTop(
               "http.response.headers.content-length", String.valueOf(blockingContentLength));
         }