add support for multi param and multi header

request.go

@@ -26,6 +26,12 @@ func NewRequest(ctx context.Context, e events.APIGatewayProxyRequest) (*http.Req
 	for k, v := range e.QueryStringParameters {
 		q.Set(k, v)
 	}
+
+	for k, values := range e.MultiValueQueryStringParameters {
+		for _, v := range values {
+			q.Add(k, v)
+		}
+	}
 	u.RawQuery = q.Encode()
 
 	// base64 encoded body
@@ -52,6 +58,10 @@ func NewRequest(ctx context.Context, e events.APIGatewayProxyRequest) (*http.Req
 		req.Header.Set(k, v)
 	}
 
+	for k, values := range e.MultiValueHeaders {
+		req.Header[k] = values
+	}
+
 	// content-length
 	if req.Header.Get("Content-Length") == "" && body != "" {
 		req.Header.Set("Content-Length", strconv.Itoa(len(body)))

request_test.go

@@ -51,6 +51,28 @@ func TestNewRequest_queryString(t *testing.T) {
 	assert.Equal(t, `desc`, r.URL.Query().Get("order"))
 }
 
+func TestNewRequest_multiValueQueryString(t *testing.T) {
+	e := events.APIGatewayProxyRequest{
+		HTTPMethod: "GET",
+		Path:       "/pets",
+		MultiValueQueryStringParameters: map[string][]string{
+			"multi_fields": []string{"name", "species"},
+			"multi_arr[]":  []string{"arr1", "arr2"},
+		},
+		QueryStringParameters: map[string]string{
+			"order":  "desc",
+			"fields": "name,species",
+		},
+	}
+
+	r, err := NewRequest(context.Background(), e)
+	assert.NoError(t, err)
+
+	assert.Equal(t, `/pets?fields=name%2Cspecies&multi_arr%5B%5D=arr1&multi_arr%5B%5D=arr2&multi_fields=name&multi_fields=species&order=desc`, r.URL.String())
+	assert.Equal(t, []string{"name", "species"}, r.URL.Query()["multi_fields"])
+	assert.Equal(t, []string{"arr1", "arr2"}, r.URL.Query()["multi_arr[]"])
+}
+
 func TestNewRequest_remoteAddr(t *testing.T) {
 	e := events.APIGatewayProxyRequest{
 		HTTPMethod: "GET",
@@ -95,6 +117,39 @@ func TestNewRequest_header(t *testing.T) {
 	assert.Equal(t, `bar`, r.Header.Get("X-Foo"))
 }
 
+func TestNewRequest_multiHeader(t *testing.T) {
+	e := events.APIGatewayProxyRequest{
+		HTTPMethod: "POST",
+		Path:       "/pets",
+		Body:       `{ "name": "Tobi" }`,
+		MultiValueHeaders: map[string][]string{
+			"X-APEX":   []string{"apex1", "apex2"},
+			"X-APEX-2": []string{"apex-1", "apex-2"},
+		},
+		Headers: map[string]string{
+			"Content-Type": "application/json",
+			"X-Foo":        "bar",
+			"Host":         "example.com",
+		},
+		RequestContext: events.APIGatewayProxyRequestContext{
+			RequestID: "1234",
+			Stage:     "prod",
+		},
+	}
+
+	r, err := NewRequest(context.Background(), e)
+	assert.NoError(t, err)
+
+	assert.Equal(t, `example.com`, r.Host)
+	assert.Equal(t, `prod`, r.Header.Get("X-Stage"))
+	assert.Equal(t, `1234`, r.Header.Get("X-Request-Id"))
+	assert.Equal(t, `18`, r.Header.Get("Content-Length"))
+	assert.Equal(t, `application/json`, r.Header.Get("Content-Type"))
+	assert.Equal(t, `bar`, r.Header.Get("X-Foo"))
+	assert.Equal(t, []string{"apex1", "apex2"}, r.Header["X-APEX"])
+	assert.Equal(t, []string{"apex-1", "apex-2"}, r.Header["X-APEX-2"])
+}
+
 func TestNewRequest_body(t *testing.T) {
 	e := events.APIGatewayProxyRequest{
 		HTTPMethod: "POST",

response.go

@@ -58,14 +58,18 @@ func (w *ResponseWriter) WriteHeader(status int) {
 	w.out.StatusCode = status
 
 	h := make(map[string]string)
+	mvh := make(map[string][]string)
 
 	for k, v := range w.Header() {
-		if len(v) > 0 {
-			h[k] = v[len(v)-1]
+		if len(v) == 1 {
+			h[k] = v[0]
+		} else if len(v) > 1 {
+			mvh[k] = v
 		}
 	}
 
 	w.out.Headers = h
+	w.out.MultiValueHeaders = mvh
 	w.wroteHeader = true
 }
 

response_test.go

@@ -30,6 +30,19 @@ func TestResponseWriter_Header(t *testing.T) {
 	assert.Equal(t, "Bar: baz\r\nFoo: bar\r\n", buf.String())
 }
 
+func TestResponseWriter_multiHeader(t *testing.T) {
+	w := NewResponse()
+	w.Header().Set("Foo", "bar")
+	w.Header().Set("Bar", "baz")
+	w.Header().Add("X-APEX", "apex1")
+	w.Header().Add("X-APEX", "apex2")
+
+	var buf bytes.Buffer
+	w.header.Write(&buf)
+
+	assert.Equal(t, "Bar: baz\r\nFoo: bar\r\nX-Apex: apex1\r\nX-Apex: apex2\r\n", buf.String())
+}
+
 func TestResponseWriter_Write_text(t *testing.T) {
 	types := []string{
 		"text/x-custom",