Add log debug headers + config testing

proxyserver/src/main/java/com/lyft/data/proxyserver/ProxyHandler.java

@@ -66,10 +66,20 @@ protected void postConnectionHook(
       log.error("Exception occurred while processing request URL: {} , request URI {} ,"
                       + " servlet path {} , toString {}", request.getRequestURL(),
               request.getRequestURI(), request.getServletPath(), request.toString(), var9);
+      errorLogHeaders(request);
       callback.failed(var9);
     }
   }
 
+  protected void errorLogHeaders(HttpServletRequest request) {
+    log.error("-------HttpServletRequest headers---------");
+    Enumeration<String> headers = request.getHeaderNames();
+    while (headers.hasMoreElements()) {
+      String header = headers.nextElement();
+      log.error(header + "->" + request.getHeader(header));
+    }
+  }
+
   protected void debugLogHeaders(HttpServletRequest request) {
     if (log.isDebugEnabled()) {
       log.debug("-------HttpServletRequest headers---------");