diff --git a/lib/fetch.js b/lib/fetch.js
index a429cfc6f..d17cce1cb 100644
--- a/lib/fetch.js
+++ b/lib/fetch.js
@@ -44,7 +44,8 @@ export function skipLoggingFetchError(error) {
         || error?.code === 'ERR_STREAM_PREMATURE_CLOSE'
         || error?.code === 'ERR_HTTP2_STREAM_ERROR'
         || error?.code === 'ERR_HTTP2_SESSION_ERROR'
-        || error?.code === 'Z_DATA_ERROR';
+        || error?.code === 'Z_DATA_ERROR'
+        || error?.code === 'Z_BUF_ERROR';
 }
 
 function doFetch(fetch_func, h1_fetch_func, options) {
diff --git a/lib/utils.js b/lib/utils.js
index 361a7aa78..8a50350e4 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -115,7 +115,16 @@ export function prepareRequestOptions(request_options, options) {
                 setPrerender(enable_domain_prerender);
             }
 
+            // Make empty headers by default for all cases.
             request_options.headers = request_options.headers || {};
+
+            // Put forward headers.
+            const forward_headers = options?.getProviderOptions && options.getProviderOptions('app.http_forward_headers');
+            if (forward_headers && typeof forward_headers === 'object' && !Array.isArray(forward_headers)) {
+                for (const [key, value] of Object.entries(forward_headers)) {
+                    request_options.headers[key] = value;
+                }
+            }
             
             if (CONFIG.PROXY || options?.proxy) {
 
@@ -135,7 +144,6 @@ export function prepareRequestOptions(request_options, options) {
                         request_options.headers['User-Agent'] = proxy.user_agent;
                     }
                     if (proxy.headers) {
-                        request_options.headers = request_options.headers || {};
                         Object.assign(request_options.headers, proxy.headers)
                     }
                     if (proxy.request_options) {
@@ -182,7 +190,6 @@ export function prepareRequestOptions(request_options, options) {
 
             var lang = options?.getProviderOptions && options.getProviderOptions('locale') || '';
             if (!disable_language) {
-                request_options.headers = request_options.headers || {};
                 request_options.headers['Accept-Language'] = 
                     lang /* !== '' */
                         ? lang.replace('_', '-') 
@@ -195,7 +202,10 @@ export function prepareRequestOptions(request_options, options) {
 
             setCookieFromJar(uri, request_options.headers, options?.jar)
 
-            if ((options?.sig || request_sig) && options?.getSigHeaders) {
+            // Has header begining from "Signature".
+            const prevent_sig = Object.keys(request_options.headers).some(key => /^signature/i.test(key));
+
+            if (!prevent_sig && (options?.sig || request_sig) && options?.getSigHeaders) {
                 try {
                     options.getSigHeaders(original_uri, function(error, headers) {
                         if (error) {
@@ -203,7 +213,6 @@ export function prepareRequestOptions(request_options, options) {
                             console.error('getSigHeaders error', error);
                             resolve(request_options);
                         } else {
-                            request_options.headers = request_options.headers || {};
                             Object.assign(request_options.headers, headers);
                             resolve(request_options);
                         }