diff --git a/README.adoc b/README.adoc
index 51e1d6d..314613c 100644
--- a/README.adoc
+++ b/README.adoc
@@ -55,19 +55,20 @@ my-function:
 In `bb` language:
 [source, clojure]
 ----
-(defn handler [{:keys [headers body context] :as event}] ...)
+(defn handler [{:keys [headers body context] :as event}]
+  ...)
 ----
-The `event` is a map containing the request `:headers`, `:body` and `:context` keys.
+`event` is a map containing `:headers`, `:body` and `:context` keys.
 
-`context` contains a map of environment variables.
-
-The `:headers` key contains headers, as such:
+`:headers` contains headers, as such:
 [source, clojure]
 ----
 {:content-type "application/json"}
 ----
 
-The `:env` map contains a map with the environment variables. Additional environment variables can be defined in the `stack.yml` file, as such:
+`:body` is the payload body.
+
+`:context` contains environment variables. Additional environment variables can be defined in the `stack.yml` file, as such:
 [source, yml]
 ----
 my-function:
@@ -78,14 +79,14 @@ my-function:
     MY_ENV1: foo
     MY_ENV2: 2
 ----
-The `:env` key will contain:
+`:context` will contain:
 [source, clojure]
 ----
  {:my-env1 "foo"
   :my-env2 2}
 ----
 
-There are cases where string keys are preferable in the payload body, and it's possible to support them by setting `keywords: false` in the Function in `stack.yml`:
+There are cases where it's preferable to have string keys in the payload body, and it's possible to support them by setting `keywords: false` in the Function in `stack.yml`:
 [source, yml]
 ----
 my-function:
diff --git a/template/bb/Dockerfile b/template/bb/Dockerfile
index 1b42ccb..b3db5c2 100644
--- a/template/bb/Dockerfile
+++ b/template/bb/Dockerfile
@@ -19,7 +19,7 @@ USER app
 WORKDIR $HOME
 
 COPY index.clj function/bb.edn ./
-COPY ring ./ring
+COPY lib ./lib
 COPY function function
 
 RUN bb prepare && bb print-deps
diff --git a/template/bb/lib/ring/util/response.clj b/template/bb/lib/ring/util/response.clj
index ed4f0a5..463646f 100644
--- a/template/bb/lib/ring/util/response.clj
+++ b/template/bb/lib/ring/util/response.clj
@@ -87,7 +87,7 @@
 
 (defn- canonical-path ^String [^File file]
   (str (.getCanonicalPath file)
-       (if (.isDirectory file) File/separatorChar)))
+       (when (.isDirectory file) File/separatorChar)))
 
 (defn- safe-path? [^String root ^String path]
   (.startsWith (canonical-path (File. root path))
@@ -173,7 +173,7 @@
 ;; As a work-around, we'll backport the fix from CLJ-1177 into
 ;; url-as-file.
 
-(defn- ^File url-as-file [^java.net.URL u]
+(defn- url-as-file ^File [^java.net.URL u]
   (-> (.getFile u)
       (str/replace \/ File/separatorChar)
       (str/replace "+" (URLEncoder/encode "+" "UTF-8"))