Don't consider closes on reused sockets hard-errors

deps/coro-http.lua

@@ -67,6 +67,7 @@ local function getConnection(host, port, tls)
       table.remove(connections, i)
       -- Make sure the connection is still alive before reusing it.
       if not connection.socket:is_closing() then
+        connection.reused = true
         return connection
       end
     end
@@ -127,7 +128,16 @@ function exports.request(method, url, headers, body)
   write(req)
   if body then write(body) end
   local res = read()
-  if not res then error("Connection closed") end
+  if not res then
+    write()
+    -- If we get an immediate close on a reused socket, try again with a new socket.
+    -- TODO: think about if this could resend requests with side effects and cause
+    -- them to double execute in the remote server.
+    if connection.reused then
+      return exports.request(method, url, headers, body)
+    end
+    error("Connection closed")
+  end
 
   body = {}
   local continue = false