diff --git a/server/gitea/cache.go b/server/gitea/cache.go
index fe7ead3..5808b07 100644
--- a/server/gitea/cache.go
+++ b/server/gitea/cache.go
@@ -54,10 +54,10 @@ func (f FileResponse) createHttpResponse() *http.Response {
 	if f.IsSymlink {
 		resp.Header.Set(giteaObjectTypeHeader, objTypeSymlink)
 	}
-	resp.Header.Set(eTagHeader, f.ETag)
-	resp.Header.Set(contentTypeHeader, f.MimeType)
-	resp.Header.Set(contentLengthHeader, fmt.Sprint(len(f.Body)))
-	resp.Header.Set(pagesCacheIndicator, "true")
+	resp.Header.Set(ETagHeader, f.ETag)
+	resp.Header.Set(ContentTypeHeader, f.MimeType)
+	resp.Header.Set(ContentLengthHeader, fmt.Sprint(len(f.Body)))
+	resp.Header.Set(PagesCacheIndicatorHeader, "true")
 
 	return resp
 }
diff --git a/server/gitea/client.go b/server/gitea/client.go
index bda5d14..8ce1598 100644
--- a/server/gitea/client.go
+++ b/server/gitea/client.go
@@ -28,16 +28,16 @@ const (
 	rawContentCacheKeyPrefix      = "rawContent"
 
 	// pages server
-	pagesCacheIndicator = "X-Pages-Cache"
+	PagesCacheIndicatorHeader = "X-Pages-Cache"
 
 	// gitea
 	giteaObjectTypeHeader = "X-Gitea-Object-Type"
 	objTypeSymlink        = "symlink"
 
 	// std
-	eTagHeader          = "ETag"
-	contentTypeHeader   = "Content-Type"
-	contentLengthHeader = "Content-Length"
+	ETagHeader          = "ETag"
+	ContentTypeHeader   = "Content-Type"
+	ContentLengthHeader = "Content-Length"
 )
 
 type Client struct {
@@ -140,7 +140,7 @@ func (client *Client) ServeRawContent(targetOwner, targetRepo, ref, resource str
 						Exists:    true,
 						IsSymlink: true,
 						Body:      []byte(linkDest),
-						ETag:      resp.Header.Get(eTagHeader),
+						ETag:      resp.Header.Get(ETagHeader),
 					}, fileCacheTimeout); err != nil {
 						log.Error().Err(err).Msg("could not save symlink in cache")
 					}
@@ -154,7 +154,7 @@ func (client *Client) ServeRawContent(targetOwner, targetRepo, ref, resource str
 			{
 				// Set the MIME type
 				mimeType := client.getMimeTypeByExtension(resource)
-				resp.Response.Header.Set(contentTypeHeader, mimeType)
+				resp.Response.Header.Set(ContentTypeHeader, mimeType)
 
 				if !shouldRespBeSavedToCache(resp.Response) {
 					return reader, resp.Response, err
@@ -163,7 +163,7 @@ func (client *Client) ServeRawContent(targetOwner, targetRepo, ref, resource str
 				// now we write to cache and respond at the sime time
 				fileResp := FileResponse{
 					Exists:   true,
-					ETag:     resp.Header.Get(eTagHeader),
+					ETag:     resp.Header.Get(ETagHeader),
 					MimeType: mimeType,
 				}
 				return fileResp.CreateCacheReader(reader, client.responseCache, cacheKey), resp.Response, nil
@@ -172,7 +172,7 @@ func (client *Client) ServeRawContent(targetOwner, targetRepo, ref, resource str
 		case http.StatusNotFound:
 			if err := client.responseCache.Set(cacheKey, FileResponse{
 				Exists: false,
-				ETag:   resp.Header.Get(eTagHeader),
+				ETag:   resp.Header.Get(ETagHeader),
 			}, fileCacheTimeout); err != nil {
 				log.Error().Err(err).Msg("could not save 404 in cache")
 			}
diff --git a/server/upstream/upstream.go b/server/upstream/upstream.go
index df54f4f..3c69bc2 100644
--- a/server/upstream/upstream.go
+++ b/server/upstream/upstream.go
@@ -16,8 +16,6 @@ import (
 )
 
 const (
-	headerContentType     = "Content-Type"
-	headerETag            = "ETag"
 	headerLastModified    = "Last-Modified"
 	headerIfModifiedSince = "If-Modified-Since"
 
@@ -155,11 +153,13 @@ func (o *Options) Upstream(ctx *context.Context, giteaClient *gitea.Client) (fin
 
 	// Set ETag & MIME
 	if res != nil {
-		ctx.Response().Header.Set(headerETag, res.Header.Get(headerETag))
+		ctx.Response().Header.Set(gitea.ETagHeader, res.Header.Get(gitea.ETagHeader))
+		ctx.Response().Header.Set(gitea.PagesCacheIndicatorHeader, res.Header.Get(gitea.PagesCacheIndicatorHeader))
+		ctx.Response().Header.Set(gitea.ContentLengthHeader, res.Header.Get(gitea.ContentLengthHeader))
 		if o.ServeRaw {
-			ctx.Response().Header.Set(headerContentType, res.Header.Get(headerContentType))
+			ctx.Response().Header.Set(gitea.ContentTypeHeader, res.Header.Get(gitea.ContentTypeHeader))
 		} else {
-			ctx.Response().Header.Set(headerContentType, rawMime)
+			ctx.Response().Header.Set(gitea.ContentTypeHeader, rawMime)
 		}
 	}