From 7a14be006dc63ccf66d9a800b89fed023a074da5 Mon Sep 17 00:00:00 2001
From: Pavel Krymets <pavel@krymets.com>
Date: Mon, 9 Apr 2018 15:16:47 -0700
Subject: [PATCH] Fast reads

---
 src/RequestHandler/managedexports.cxx | 28 +++++++++++++++++----------
 1 file changed, 18 insertions(+), 10 deletions(-)

diff --git a/src/RequestHandler/managedexports.cxx b/src/RequestHandler/managedexports.cxx
index 46510a00b7..5608aac3e5 100644
--- a/src/RequestHandler/managedexports.cxx
+++ b/src/RequestHandler/managedexports.cxx
@@ -206,18 +206,26 @@ http_read_request_bytes(
     }
     IHttpRequest *pHttpRequest = (IHttpRequest*)pInProcessHandler->QueryHttpContext()->GetRequest();
 
-    BOOL fAsync = TRUE;
 
-    hr = pHttpRequest->ReadEntityBody(
-        pvBuffer,
-        dwCbBuffer,
-        fAsync,
-        pdwBytesReceived,
-        pfCompletionPending);
-
-    if (hr == HRESULT_FROM_WIN32(ERROR_HANDLE_EOF))
+    if (pHttpRequest->GetRemainingEntityBytes() > 0)
     {
-        // We reached the end of the data
+        BOOL fAsync = TRUE;
+        hr = pHttpRequest->ReadEntityBody(
+            pvBuffer,
+            dwCbBuffer,
+            fAsync,
+            pdwBytesReceived,
+            pfCompletionPending);
+
+        if (hr == HRESULT_FROM_WIN32(ERROR_HANDLE_EOF))
+        {
+            // We reached the end of the data
+            hr = S_OK;
+        }
+    }
+    else
+    {
+        // nothing to read
         hr = S_OK;
     }