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diff --git a/html/repo_query_cacher_client.js b/html/repo_query_cacher_client.js
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+/**
+ * This file is part of Haketilo.
+ *
+ * Function: Making requests to remote repositories through a response cache in
+ *           operating in the content script of a browser tab.
+ *
+ * Copyright (C) 2022 Wojtek Kosior <koszko@koszko.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * As additional permission under GNU GPL version 3 section 7, you
+ * may distribute forms of that code without the copy of the GNU
+ * GPL normally required by section 4, provided you include this
+ * license notice and, in case of non-source distribution, a URL
+ * through which recipients can access the Corresponding Source.
+ * If you modify file(s) with this exception, you may extend this
+ * exception to your version of the file(s), but you are not
+ * obligated to do so. If you do not wish to do so, delete this
+ * exception statement from your version.
+ *
+ * As a special exception to the GPL, any HTML file which merely
+ * makes function calls to this code, and for that purpose
+ * includes it by reference shall be deemed a separate work for
+ * copyright law purposes. If you modify this code, you may extend
+ * this exception to your version of the code, but you are not
+ * obligated to do so. If you do not wish to do so, delete this
+ * exception statement from your version.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * I, Wojtek Kosior, thereby promise not to sue for violation of this file's
+ * license. Although I request that you do not make use of this code in a
+ * proprietary program, I am not going to enforce this in court.
+ */
+
+#FROM common/browser.js IMPORT browser
+
+/*
+ * This is a complementary function to error_data_jsonifiable() in
+ * common/misc.js.
+ */
+function error_from_jsonifiable_data(jsonifiable) {
+    const arg_props = ["message", "fileName", "lineNumber"];
+    return new window[jsonifiable.name](...arg_props.map(p => jsonifiable[p]));
+}
+
+/*
+ * Make it possible to recover a Response object. This is a complementary
+ * function to response_data_jsonifiable() in background/CORS_bypass_server.js.
+ */
+function response_from_jsonifiable_data(jsonifiable) {
+    const body = jsonifiable.body, body_len = body.length / 2;
+    const body_buf = new Uint8Array(body_len);
+
+    for (let i = 0; i < body_len; i++)
+	body_buf[i] = parseInt(`0x${body.substring(i * 2, i * 2 + 2)}`);
+
+    const init = {
+	status:     jsonifiable.status,
+	statusText: jsonifiable.statusText,
+	headers:    new Headers(jsonifiable.headers)
+    };
+
+    return new Response(body_buf, init);
+}
+
+async function indirect_fetch(tab_id, url) {
+    const msg = ["repo_query", url];
+    const jsonifiable = await browser.tabs.sendMessage(tab_id, msg);
+
+    if ("error" in jsonifiable)
+	throw error_from_jsonifiable_data(jsonifiable);
+
+    return response_from_jsonifiable_data(jsonifiable);
+}
+#EXPORT indirect_fetch