Minimize use of blocking .get()'s in test_http_server

Author: ras0219-msft

Release/tests/functional/http/utilities/test_http_server.cpp

@@ -520,23 +520,24 @@ class _test_http_server
             for (auto it = result.headers().begin(); it != result.headers().end(); ++it)
                 tr->m_headers[it->first] = it->second;
 
-            tr->m_body = result.extract_vector().get();
-
-            {
-                pplx::extensibility::scoped_critical_section_t lock(m_lock);
-                m_responding_requests[tr->m_request_id] = result;
-            }
+            result.extract_vector().then([this,tr,result](const std::vector<unsigned char>& v) {
+                tr->m_body = v;
+                {
+                    pplx::extensibility::scoped_critical_section_t lock(m_lock);
+                    m_responding_requests[tr->m_request_id] = result;
+                }
 
-            while (!m_cancel)
-            {
-                pplx::extensibility::scoped_critical_section_t lock(m_lock);
-                if (m_requests.size() > 0)
+                while (!m_cancel)
                 {
-                    m_requests[0].set(tr);
-                    m_requests.erase(m_requests.begin());
-                    return;
+                    pplx::extensibility::scoped_critical_section_t lock(m_lock);
+                    if (m_requests.size() > 0)
+                    {
+                        m_requests[0].set(tr);
+                        m_requests.erase(m_requests.begin());
+                        return;
+                    }
                 }
-            }
+            });
         });
     }