diff --git a/internal/hubmodule/composer/hooks.go b/internal/hubmodule/composer/hooks.go
index 83fdc01..331fd4c 100644
--- a/internal/hubmodule/composer/hooks.go
+++ b/internal/hubmodule/composer/hooks.go
@@ -45,7 +45,7 @@ func rewriteResponse(
 ) (int, map[string]string, []byte, error) {
 	switch {
 	case path == "/packages.json":
-		data, changed, err := rewriteComposerRootBody(body, ctx.Domain)
+		data, changed, err := rewriteComposerRootBody(body)
 		if err != nil {
 			return status, headers, body, err
 		}
@@ -104,29 +104,32 @@ func contentType(_ *hooks.RequestContext, locatorPath string) string {
 	return ""
 }
 
-func rewriteComposerRootBody(body []byte, domain string) ([]byte, bool, error) {
-	type root struct {
-		Packages map[string]string `json:"packages"`
-	}
-	var payload root
-	if err := json.Unmarshal(body, &payload); err != nil {
+func rewriteComposerRootBody(body []byte) ([]byte, bool, error) {
+	// packages.json from Packagist may contain "packages" as array or object; we only care about URL-like fields.
+	var root map[string]any
+	if err := json.Unmarshal(body, &root); err != nil {
 		return nil, false, err
 	}
-	if len(payload.Packages) == 0 {
-		return body, false, nil
-	}
+
 	changed := false
-	for key, value := range payload.Packages {
-		rewritten := rewriteComposerAbsolute(domain, value)
-		if rewritten != value {
-			payload.Packages[key] = rewritten
+	for key, val := range root {
+		str, ok := val.(string)
+		if !ok {
+			continue
+		}
+		switch strings.ToLower(key) {
+		// case "metadata-url", "providers-url", "providers-lazy-url", "notify", "notify-batch", "search":
+		case "metadata-url":
+			str = strings.ReplaceAll(str, "https://repo.packagist.org", "")
+			root[key] = str
 			changed = true
 		}
 	}
+
 	if !changed {
 		return body, false, nil
 	}
-	data, err := json.Marshal(payload)
+	data, err := json.Marshal(root)
 	if err != nil {
 		return nil, false, err
 	}
@@ -166,7 +169,11 @@ func rewriteComposerMetadata(body []byte, domain string) ([]byte, bool, error) {
 	return data, true, nil
 }
 
-func rewriteComposerPackagesPayload(raw json.RawMessage, domain string, packageName string) (json.RawMessage, bool, error) {
+func rewriteComposerPackagesPayload(
+	raw json.RawMessage,
+	domain string,
+	packageName string,
+) (json.RawMessage, bool, error) {
 	var asArray []map[string]any
 	if err := json.Unmarshal(raw, &asArray); err == nil {
 		rewrote := rewriteComposerVersionSlice(asArray, domain, packageName)
@@ -229,7 +236,7 @@ func rewriteComposerVersion(entry map[string]any, domain string, packageName str
 	if !ok || urlValue == "" {
 		return changed
 	}
-	rewritten := rewriteComposerDistURL(domain, urlValue)
+	rewritten := rewriteComposerDistURL(urlValue)
 	if rewritten == urlValue {
 		return changed
 	}
@@ -237,46 +244,25 @@ func rewriteComposerVersion(entry map[string]any, domain string, packageName str
 	return true
 }
 
-func rewriteComposerDistURL(domain, original string) string {
+func rewriteComposerDistURL(original string) string {
 	parsed, err := url.Parse(original)
 	if err != nil || parsed.Scheme == "" || parsed.Host == "" {
 		return original
 	}
-	prefix := "/dist/" + parsed.Scheme + "/" + parsed.Host
-	newURL := url.URL{
-		Scheme:   "https",
-		Host:     domain,
-		Path:     prefix + parsed.Path,
-		RawQuery: parsed.RawQuery,
-		Fragment: parsed.Fragment,
-	}
-	if raw := parsed.RawPath; raw != "" {
-		newURL.RawPath = prefix + raw
-	}
-	return newURL.String()
-}
-
-func rewriteComposerAbsolute(domain, raw string) string {
-	if raw == "" {
-		return raw
-	}
-	if strings.HasPrefix(raw, "//") {
-		return "https://" + domain + strings.TrimPrefix(raw, "//")
-	}
-	if strings.HasPrefix(raw, "http://") || strings.HasPrefix(raw, "https://") {
-		parsed, err := url.Parse(raw)
-		if err != nil {
-			return raw
+	if isPackagistHost(parsed.Host) {
+		pathVal := parsed.Path
+		if raw := parsed.RawPath; raw != "" {
+			pathVal = raw
 		}
-		parsed.Host = domain
-		parsed.Scheme = "https"
-		return parsed.String()
+		if !strings.HasPrefix(pathVal, "/") {
+			pathVal = "/" + pathVal
+		}
+		if parsed.RawQuery != "" {
+			return pathVal + "?" + parsed.RawQuery
+		}
+		return pathVal
 	}
-	pathVal := raw
-	if !strings.HasPrefix(pathVal, "/") {
-		pathVal = "/" + pathVal
-	}
-	return "https://" + domain + pathVal
+	return original
 }
 
 func isComposerMetadataPath(path string) bool {
@@ -331,3 +317,14 @@ func parseComposerDistURL(path string, rawQuery string) (*url.URL, bool) {
 	}
 	return target, true
 }
+
+func stripPackagistHost(raw string) string {
+	raw = strings.TrimSpace(raw)
+	raw = strings.ReplaceAll(raw, "https://repo.packagist.org", "")
+	raw = strings.ReplaceAll(raw, "http://repo.packagist.org", "")
+	return raw
+}
+
+func isPackagistHost(host string) bool {
+	return strings.EqualFold(host, "repo.packagist.org")
+}
diff --git a/internal/hubmodule/composer/hooks_test.go b/internal/hubmodule/composer/hooks_test.go
index fd50579..7ba2fa5 100644
--- a/internal/hubmodule/composer/hooks_test.go
+++ b/internal/hubmodule/composer/hooks_test.go
@@ -26,7 +26,7 @@ func TestResolveDistUpstream(t *testing.T) {
 
 func TestRewriteResponseUpdatesURLs(t *testing.T) {
 	ctx := &hooks.RequestContext{Domain: "cache.example"}
-	body := []byte(`{"packages":{"a/b":{"1.0.0":{"dist":{"url":"https://pkg.example/dist.zip"}}}}}`)
+	body := []byte(`{"packages":{"a/b":{"1.0.0":{"dist":{"url":"https://repo.packagist.org/dist/package.zip"}}}}}`)
 	_, headers, rewritten, err := rewriteResponse(ctx, 200, map[string]string{}, body, "/p2/a/b.json")
 	if err != nil {
 		t.Fatalf("rewrite failed: %v", err)
@@ -37,7 +37,7 @@ func TestRewriteResponseUpdatesURLs(t *testing.T) {
 	if headers["Content-Type"] != "application/json" {
 		t.Fatalf("expected json content type")
 	}
-	if !strings.Contains(string(rewritten), "https://cache.example/dist/https/pkg.example/dist.zip") {
-		t.Fatalf("expected rewritten URL, got %s", string(rewritten))
+	if !strings.Contains(string(rewritten), "/dist/package.zip") {
+		t.Fatalf("expected stripped packagist host, got %s", string(rewritten))
 	}
 }
diff --git a/internal/proxy/handler.go b/internal/proxy/handler.go
index 400ca56..abf12b9 100644
--- a/internal/proxy/handler.go
+++ b/internal/proxy/handler.go
@@ -263,7 +263,8 @@ func applyHookRewrite(hook *hookState, resp *http.Response, path string) (*http.
 	body, err := io.ReadAll(resp.Body)
 	resp.Body.Close()
 	if err != nil {
-		return nil, err
+		resp.Body = io.NopCloser(bytes.NewReader(nil))
+		return resp, err
 	}
 	headers := make(map[string]string, len(resp.Header))
 	for key, values := range resp.Header {
@@ -273,7 +274,9 @@ func applyHookRewrite(hook *hookState, resp *http.Response, path string) (*http.
 	}
 	status, newHeaders, newBody, rewriteErr := hook.def.RewriteResponse(hook.ctx, resp.StatusCode, headers, body, path)
 	if rewriteErr != nil {
-		return nil, rewriteErr
+		resp.Body = io.NopCloser(bytes.NewReader(body))
+		resp.ContentLength = int64(len(body))
+		return resp, rewriteErr
 	}
 	if newHeaders == nil {
 		newHeaders = headers