Index: src/Server.cc
===================================================================
--- src/Server.cc       (revision 115)
+++ src/Server.cc       (working copy)
@@ -723,8 +723,7 @@
 
     // XXX: entry->bytesWanted returns contentSize-1 if entry can accept data.
     // We have to add 1 to avoid suspending forever.
-    const size_t bytesWanted = entry->bytesWanted(Range<size_t>(0, contentSize));
-    const size_t spaceAvailable = bytesWanted >  0 ? (bytesWanted + 1) : 0;
+    const size_t spaceAvailable = entry->bytesWanted(Range<size_t>(0, contentSize+1));
 
     if (spaceAvailable < contentSize ) {
         // No or partial body data consuming
@@ -734,8 +733,7 @@
         entry->deferProducer(call);
     }
 
-    // XXX: bytesWanted API does not allow us to write just one byte!
-    if (!spaceAvailable && contentSize > 1)  {
+    if (!spaceAvailable && contentSize > 0)  {
         debugs(11, 5, HERE << "NOT storing " << contentSize << " bytes of adapted " <<
                "response body at offset " << adaptedBodySource->consumedSize());
         return;