Small fixes

Author: itssimon

src/main/java/io/apitally/common/ApitallyClient.java

@@ -117,7 +117,6 @@ private void sendStartupData() {
         if (startupData == null) {
             return;
         }
-        startupDataSent = true; // Prevent duplicate sending in sync()
         HttpRequest request = HttpRequest.newBuilder()
                 .uri(getHubUrl("startup"))
                 .header("Content-Type", "application/json")

src/main/java/io/apitally/spring/ApitallyFilter.java

@@ -78,11 +78,12 @@ protected void doFilterInternal(@NonNull HttpServletRequest request, @NonNull Ht
 
                 // Add request to counter
                 final long requestContentLength = request.getContentLengthLong();
-                final long requestSize = requestContentLength >= 0 ? requestContentLength : requestBody.length;
+                final long requestSize = requestContentLength >= 0 ? requestContentLength
+                        : cachingRequest != null ? requestBody.length : -1;
                 final long responseContentLength = getResponseContentLength(response);
                 final long responseSize = responseContentLength >= 0
                         ? responseContentLength
-                        : responseBody.length;
+                        : (cachingResponse != null ? responseBody.length : -1);
                 client.requestCounter
                         .addRequest(consumerIdentifier, request.getMethod(), path, response.getStatus(),
                                 responseTimeInMillis,