diff --git a/proxy/create_container_interceptor.go b/proxy/create_container_interceptor.go
index 42b60ed1e1..2983c6e0fc 100644
--- a/proxy/create_container_interceptor.go
+++ b/proxy/create_container_interceptor.go
@@ -45,6 +45,7 @@ func (i *createContainerInterceptor) InterceptRequest(r *http.Request) error {
 		return err
 	}
 	r.Body.Close()
+	r.Body = ioutil.NopCloser(bytes.NewReader(body))
 
 	container := createContainerRequestBody{}
 	if err := json.Unmarshal(body, &container); err != nil {
@@ -68,14 +69,14 @@ func (i *createContainerInterceptor) InterceptRequest(r *http.Request) error {
 		if err := i.setWeaveDNS(&container, r); err != nil {
 			return err
 		}
-	}
 
-	newBody, err := json.Marshal(container)
-	if err != nil {
-		return err
+		newBody, err := json.Marshal(container)
+		if err != nil {
+			return err
+		}
+		r.Body = ioutil.NopCloser(bytes.NewReader(newBody))
+		r.ContentLength = int64(len(newBody))
 	}
-	r.Body = ioutil.NopCloser(bytes.NewReader(newBody))
-	r.ContentLength = int64(len(newBody))
 
 	return nil
 }
diff --git a/proxy/create_exec_interceptor.go b/proxy/create_exec_interceptor.go
index f15ed56f25..2ba19a6116 100644
--- a/proxy/create_exec_interceptor.go
+++ b/proxy/create_exec_interceptor.go
@@ -1,6 +1,7 @@
 package proxy
 
 import (
+	"bytes"
 	"encoding/json"
 	"io/ioutil"
 	"net/http"
@@ -18,6 +19,7 @@ func (i *createExecInterceptor) InterceptRequest(r *http.Request) error {
 		return err
 	}
 	r.Body.Close()
+	r.Body = ioutil.NopCloser(bytes.NewReader(body))
 
 	options := docker.CreateExecOptions{}
 	if err := json.Unmarshal(body, &options); err != nil {
@@ -29,21 +31,21 @@ func (i *createExecInterceptor) InterceptRequest(r *http.Request) error {
 		return err
 	}
 
-	_, hasWeaveWait := container.Volumes["/w"]
+	if _, hasWeaveWait := container.Volumes["/w"]; !hasWeaveWait {
+		return nil
+	}
+
 	cidrs, err := i.proxy.weaveCIDRsFromConfig(container.Config, container.HostConfig)
 	if err != nil {
 		Info.Printf("Ignoring container %s due to %s", container.ID, err)
-	} else if hasWeaveWait {
-		Info.Printf("Exec in container %s with WEAVE_CIDR \"%s\"", container.ID, strings.Join(cidrs, " "))
-		cmd := append(weaveWaitEntrypoint, "-s")
-		options.Cmd = append(cmd, options.Cmd...)
+		return nil
 	}
 
-	if err := marshalRequestBody(r, options); err != nil {
-		return err
-	}
+	Info.Printf("Exec in container %s with WEAVE_CIDR \"%s\"", container.ID, strings.Join(cidrs, " "))
+	cmd := append(weaveWaitEntrypoint, "-s")
+	options.Cmd = append(cmd, options.Cmd...)
 
-	return nil
+	return marshalRequestBody(r, options)
 }
 
 func (i *createExecInterceptor) InterceptResponse(r *http.Response) error {
diff --git a/test/600_proxy_docker_py_test.sh b/test/600_proxy_docker_py_test.sh
index 84d27608a5..57cc9b7c1c 100755
--- a/test/600_proxy_docker_py_test.sh
+++ b/test/600_proxy_docker_py_test.sh
@@ -5,6 +5,8 @@
 start_suite "Run docker-py test suite against the proxy"
 
 docker_on $HOST1 pull joffrey/docker-py >/dev/null
+# workaround for https://github.com/docker/docker-py/issues/745
+docker_on $HOST1 pull busybox >/dev/null
 
 weave_on $HOST1 launch-proxy --no-default-ipam
 
@@ -13,7 +15,7 @@ if docker_on $HOST1 run \
     -e DOCKER_HOST=tcp://172.17.42.1:12375 \
     -v /tmp:/tmp \
     -v /var/run/docker.sock:/var/run/docker.sock \
-    joffrey/docker-py python tests/integration_test.py ; then
+    joffrey/docker-py py.test tests/integration_test.py ; then
     assert_raises "true"
 else
     assert_raises "false"