diff --git a/etc/dispatch.lua b/etc/dispatch.lua
index cab7f59..2485415 100644
--- a/etc/dispatch.lua
+++ b/etc/dispatch.lua
@@ -5,6 +5,7 @@
 -----------------------------------------------------------------------------
 local base = _G
 local table = require("table")
+local string = require("string")
 local socket = require("socket")
 local coroutine = require("coroutine")
 module("dispatch")
@@ -43,26 +44,32 @@ end
 -----------------------------------------------------------------------------
 -- Mega hack. Don't try to do this at home.
 -----------------------------------------------------------------------------
--- we can't yield across calls to protect, so we rewrite it with coxpcall
+-- we can't yield across calls to protect on Lua 5.1, so we rewrite it with
+-- coroutines
 -- make sure you don't require any module that uses socket.protect before
 -- loading our hack
-function socket.protect(f)
-  return function(...)
-    local co = coroutine.create(f)
-    while true do
-      local results = {coroutine.resume(co, ...)}
-      local status = table.remove(results, 1)
-      if not status then
-        if base.type(results[1]) == 'table' then
-          return nil, results[1][1]
-        else base.error(results[1]) end
-      end
-      if coroutine.status(co) == "suspended" then
-        arg = {coroutine.yield(base.unpack(results))}
+if string.sub(base._VERSION, -3) == "5.1" then
+  local function _protect(co, status, ...)
+    if not status then
+      local msg = ...
+      if base.type(msg) == 'table' then
+        return nil, msg[1]
       else
-        return base.unpack(results)
+        base.error(msg, 0)
       end
     end
+    if coroutine.status(co) == "suspended" then
+      return _protect(co, coroutine.resume(co, coroutine.yield(...)))
+    else
+      return ...
+    end
+  end
+
+  function socket.protect(f)
+    return function(...)
+      local co = coroutine.create(f)
+      return _protect(co, coroutine.resume(co, ...))
+    end
   end
 end
 
diff --git a/src/except.c b/src/except.c
index 002e701..4faa208 100644
--- a/src/except.c
+++ b/src/except.c
@@ -9,6 +9,15 @@
 
 #include "except.h"
 
+#if LUA_VERSION_NUM < 502
+#define lua_pcallk(L, na, nr, err, ctx, cont) \
+    ((void)ctx,(void)cont,lua_pcall(L, na, nr, err))
+#endif
+
+#if LUA_VERSION_NUM < 503
+typedef int lua_KContext;
+#endif
+
 /*=========================================================================*\
 * Internal function prototypes.
 \*=========================================================================*/
@@ -73,14 +82,30 @@ static int unwrap(lua_State *L) {
     } else return 0;
 }
 
+static int protected_finish(lua_State *L, int status, lua_KContext ctx) {
+    (void)ctx;
+    if (status != 0 && status != LUA_YIELD) {
+        if (unwrap(L)) return 2;
+        else return lua_error(L);
+    } else return lua_gettop(L);
+}
+
+#if LUA_VERSION_NUM == 502
+static int protected_cont(lua_State *L) {
+    int ctx = 0;
+    int status = lua_getctx(L, &ctx);
+    return protected_finish(L, status, ctx);
+}
+#else
+#define protected_cont protected_finish
+#endif
+
 static int protected_(lua_State *L) {
+    int status;
     lua_pushvalue(L, lua_upvalueindex(1));
     lua_insert(L, 1);
-    if (lua_pcall(L, lua_gettop(L) - 1, LUA_MULTRET, 0) != 0) {
-        if (unwrap(L)) return 2;
-        else lua_error(L);
-        return 0;
-    } else return lua_gettop(L);
+    status = lua_pcallk(L, lua_gettop(L) - 1, LUA_MULTRET, 0, 0, protected_cont);
+    return protected_finish(L, status, 0);
 }
 
 static int global_protect(lua_State *L) {
diff --git a/src/http.lua b/src/http.lua
index 1d0eb50..d5457f6 100644
--- a/src/http.lua
+++ b/src/http.lua
@@ -209,8 +209,7 @@ end
 
 local function adjustheaders(reqt)
     -- default headers
-    local host = reqt.host
-    if reqt.port then host = host .. ":" .. reqt.port end
+    local host = string.gsub(reqt.authority, "^.-@", "")
     local lower = {
         ["user-agent"] = _M.USERAGENT,
         ["host"] = host,
@@ -353,4 +352,4 @@ _M.request = socket.protect(function(reqt, body)
     else return trequest(reqt) end
 end)
 
-return _M
\ No newline at end of file
+return _M
diff --git a/src/usocket.c b/src/usocket.c
index da09130..4fe333e 100644
--- a/src/usocket.c
+++ b/src/usocket.c
@@ -82,7 +82,6 @@ int socket_close(void) {
 \*-------------------------------------------------------------------------*/
 void socket_destroy(p_socket ps) {
     if (*ps != SOCKET_INVALID) {
-        socket_setblocking(ps);
         close(*ps);
         *ps = SOCKET_INVALID;
     }
@@ -130,9 +129,7 @@ int socket_bind(p_socket ps, SA *addr, socklen_t len) {
 \*-------------------------------------------------------------------------*/
 int socket_listen(p_socket ps, int backlog) {
     int err = IO_DONE; 
-    socket_setblocking(ps);
     if (listen(*ps, backlog)) err = errno; 
-    socket_setnonblocking(ps);
     return err;
 }
 
@@ -140,9 +137,7 @@ int socket_listen(p_socket ps, int backlog) {
 * 
 \*-------------------------------------------------------------------------*/
 void socket_shutdown(p_socket ps, int how) {
-    socket_setblocking(ps);
     shutdown(*ps, how);
-    socket_setnonblocking(ps);
 }
 
 /*-------------------------------------------------------------------------*\