diff --git a/libpathod/rparse.py b/libpathod/rparse.py
index d083e335a..98254abbc 100644
--- a/libpathod/rparse.py
+++ b/libpathod/rparse.py
@@ -31,7 +31,7 @@ def ready_actions(length, lst):
         itms = list(i)
         if i[0] == "r":
             itms[0] = random.randrange(length)
-        if i[0] == "a":
+        elif i[0] == "a":
             itms[0] = length+1
         ret.append(tuple(itms))
     ret.sort()
@@ -68,10 +68,10 @@ def write_values(fp, vals, actions, sofar=0, skip=0, blocksize=BLOCKSIZE):
                 offset += send_chunk(fp, v, blocksize, offset, a[0]-sofar-offset)
                 if a[1] == "pause":
                     time.sleep(a[2])
-                elif a[1] == "inject":
-                    send_chunk(fp, a[2], blocksize, 0, len(a[2]))
                 elif a[1] == "disconnect":
                     return True
+                elif a[1] == "inject":
+                    send_chunk(fp, a[2], blocksize, 0, len(a[2]))
             send_chunk(fp, v, blocksize, offset, len(v))
             sofar += len(v)
     except tcp.NetLibDisconnect:
@@ -501,6 +501,9 @@ class Code:
 class Message:
     version = "HTTP/1.1"
     def length(self):
+        """
+            Calculate the length of the base message without any applied actions.
+        """
         l = sum(len(x) for x in self.preamble())
         l += 2
         for i in self.headers:
@@ -510,6 +513,20 @@ class Message:
         l += len(self.body)
         return l
 
+    def effective_length(self, actions):
+        """
+            Calculate the length of the base message with all applied actions.
+        """
+        # Order matters here, and must match the order of application in
+        # write_values.
+        l = self.length()
+        for i in reversed(actions):
+            if i[1] == "disconnect":
+                return i[0]
+            elif i[1] == "inject":
+                l += len(i[2])
+        return l
+
     def serve(self, fp):
         started = time.time()
         if self.body and not utils.get_header("Content-Length", self.headers):
diff --git a/test/test_rparse.py b/test/test_rparse.py
index 23c9b3e66..0cb3e3731 100644
--- a/test/test_rparse.py
+++ b/test/test_rparse.py
@@ -433,6 +433,36 @@ class TestResponse:
         testlen(rparse.parse_response({}, "400'msg':h'foo'='bar'"))
         testlen(rparse.parse_response({}, "400'msg':h'foo'='bar':b@100b"))
 
+    def test_effective_length(self):
+        def testlen(x, actions):
+            s = cStringIO.StringIO()
+            x.serve(s)
+            assert x.effective_length(actions) == len(s.getvalue())
+        actions = [
+
+        ]
+        r = rparse.parse_response({}, "400'msg':b@100")
+
+        actions = [
+            (0, "disconnect"),
+        ]
+        r.actions = actions
+        testlen(r, actions)
+
+        actions = [
+            (0, "disconnect"),
+            (0, "inject", "foo")
+        ]
+        r.actions = actions
+        testlen(r, actions)
+
+        actions = [
+            (0, "inject", "foo")
+        ]
+        r.actions = actions
+        testlen(r, actions)
+
+
 
 def test_read_file():
     tutils.raises(rparse.FileAccessDenied, rparse.read_file, {}, "=/foo")