diff --git a/cmd/protoc-gen-goclay/genhandler/tpl_httpclient.go b/cmd/protoc-gen-goclay/genhandler/tpl_httpclient.go
index 7d18e4b..2909f0b 100644
--- a/cmd/protoc-gen-goclay/genhandler/tpl_httpclient.go
+++ b/cmd/protoc-gen-goclay/genhandler/tpl_httpclient.go
@@ -45,6 +45,7 @@ func (c *{{ $svc.GetName }}_httpClient) {{ $m.GetName }}(ctx {{ pkg "context" }}
     if err != nil {
         return nil, {{ pkg "errors" }}Wrap(err, "can't initiate HTTP request")
     }
+    req = req.WithContext(ctx)
 
     req.Header.Add("Accept", m.ContentType())
 
diff --git a/integration/Makefile b/integration/Makefile
index 0318804..7b000ac 100644
--- a/integration/Makefile
+++ b/integration/Makefile
@@ -8,6 +8,8 @@ VGO_BIN:=$(GOBIN)/vgo
 GEN_CLAY_BIN:=$(CURDIR)/bin/protoc-gen-goclay
 export GEN_CLAY_BIN
 
+all: clean build test
+
 # install vgo
 $(VGO_BIN):
 ifeq (${VGO_VERSION},master)
@@ -55,4 +57,4 @@ test: $(VGO_BIN) build
 		fi
 
 clean:
-	@find */ -type f -name Makefile -execdir sh -c "make clean; echo ;" \;
\ No newline at end of file
+	@find */ -type f -name Makefile -execdir sh -c "make clean; echo ;" \;
diff --git a/integration/http_headers_passthru/pb/strings/strings_test.go b/integration/http_headers_passthru/pb/strings/strings_test.go
index e933c94..ae14e96 100644
--- a/integration/http_headers_passthru/pb/strings/strings_test.go
+++ b/integration/http_headers_passthru/pb/strings/strings_test.go
@@ -105,6 +105,64 @@ func TestHTTPHeadersPass_genClient(t *testing.T) {
 	so.True(calledFunc)
 }
 
+// TestHTTPHeadersPass_genClient_outgoingContext tests that generated HTTP client
+// passes headers from grpc.ToOutgoingContext to the request by default.
+func TestHTTPHeadersPass_genClient_outgoingContext(t *testing.T) {
+	so := assert.New(t)
+	impl, ts := getTestSvc()
+	defer ts.Close()
+
+	tc := []a{
+		a{
+			Name:   "User-Agent",
+			Values: []string{"Go-http-client/1.1"},
+		},
+		a{
+			Name:   "Accept",
+			Values: []string{"application/json"},
+		},
+	}
+	pt := []a{
+		a{
+			Name:   "X-Test-Passthrough",
+			Values: []string{"v1", "Value2", "3"},
+		},
+	}
+
+	calledFunc := false
+
+	impl.f = func(ctx context.Context, req *String) (*String, error) {
+		calledFunc = true
+		md, ok := metadata.FromIncomingContext(ctx)
+		so.True(ok)
+
+		for _, c := range tc {
+			got := md.Get(strings.ToLower(c.Name))
+			so.EqualValues(c.Values, got)
+		}
+
+		for _, c := range pt {
+			got := md.Get(strings.ToLower(c.Name))
+			so.EqualValues(c.Values, got)
+		}
+
+		return &String{}, nil
+	}
+
+	ctx := context.Background()
+
+	for _, c := range pt {
+		for i := range c.Values {
+			ctx = metadata.AppendToOutgoingContext(ctx, c.Name, c.Values[i])
+		}
+	}
+
+	cli := NewStringsHTTPClient(http.DefaultClient, ts.URL)
+	_, err := cli.ToLower(ctx, &String{})
+	so.Nil(err)
+	so.True(calledFunc)
+}
+
 func getTestSvc() (*StringsImplementation, *httptest.Server) {
 	mux := http.NewServeMux()
 	impl := NewStrings()
diff --git a/transport/httpclient/requestmw.go b/transport/httpclient/requestmw.go
index b19a35d..228a07e 100644
--- a/transport/httpclient/requestmw.go
+++ b/transport/httpclient/requestmw.go
@@ -81,7 +81,7 @@ type RequestMutator func(*http.Request) (*http.Request, error)
 type ResponseMutator func(*http.Response) (*http.Response, error)
 
 // DefaultRequestMutators are used for every outgoing request.
-var DefaultRequestMutators = []RequestMutator{}
+var DefaultRequestMutators = []RequestMutator{clientReqHeadersFromMD()}
 
 // DefaultResponseMutators are used for every received response.
 var DefaultResponseMutators = []ResponseMutator{}
@@ -95,3 +95,25 @@ func clientRspHeaderCopier(md *metadata.MD) ResponseMutator {
 		return rsp, nil
 	}
 }
+
+// clientReqHeadersFromMD pushes metadata from OutgoingContext to the
+// request headers.
+func clientReqHeadersFromMD() RequestMutator {
+	return func(req *http.Request) (*http.Request, error) {
+		fmt.Println("called")
+		ctxmd, ok := metadata.FromOutgoingContext(req.Context())
+		if !ok {
+			return req, nil
+		}
+
+		for k := range ctxmd {
+			vv := ctxmd.Get(k)
+			for i := range vv {
+				req.Header.Add(k, vv[i])
+			}
+		}
+
+		return req, nil
+	}
+
+}