Tell fasthttp to not set "Content-Length: 0" on non cached content (#107)

fix #97

Co-authored-by: 6543 <6543@obermui.de>
Reviewed-on: https://codeberg.org/Codeberg/pages-server/pulls/107

integration/get_test.go

@@ -59,6 +59,8 @@ func TestGetContent(t *testing.T) {
 	assert.EqualValues(t, "text/html; charset=utf-8", resp.Header.Get("Content-Type"))
 	assert.True(t, getSize(resp.Body) > 100)
 	assert.Len(t, resp.Header.Get("ETag"), 42)
+
+	// TODO: test get of non cachable content (content size > fileCacheSizeLimit)
 }
 
 func TestCustomDomain(t *testing.T) {

server/gitea/client.go

@@ -82,7 +82,6 @@ func (client *Client) ServeRawContent(uri string) (*fasthttp.Response, error) {
 	if err != nil {
 		return nil, err
 	}
-	// resp.SetBodyStream(&strings.Reader{}, -1)
 
 	if err != nil {
 		return nil, err

server/upstream/upstream.go

@@ -181,6 +181,9 @@ func (o *Options) Upstream(ctx *fasthttp.RequestCtx, giteaClient *gitea.Client,
 	var cacheBodyWriter bytes.Buffer
 	if res != nil {
 		if res.Header.ContentLength() > fileCacheSizeLimit {
+			// fasthttp else will set "Content-Length: 0"
+			ctx.Response.SetBodyStream(&strings.Reader{}, -1)
+
 			err = res.BodyWriteTo(ctx.Response.BodyWriter())
 		} else {
 			// TODO: cache is half-empty if request is cancelled - does the ctx.Err() below do the trick?