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diff --git a/lib/handlers/assembly-documentation/router.js b/lib/handlers/assembly-documentation/router.js
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+++ b/lib/handlers/assembly-documentation/router.js
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+// Copyright (c) 2021, Compiler Explorer Authors
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+//     * Redistributions of source code must retain the above copyright notice,
+//       this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above copyright
+//       notice, this list of conditions and the following disclaimer in the
+//       documentation and/or other materials provided with the distribution.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+
+import { propsFor } from '../../properties';
+
+import { Amd64DocumentationHandler } from './amd64';
+import { Arm32DocumentationHandler } from './arm32';
+import { JavaDocumentationHandler } from './java';
+import { Mos6502DocumentationHandler } from './mos6502';
+
+/** @type {Record.<string, BaseAssemblyDocumentationHandler>} */
+const ASSEMBLY_DOCUMENTATION_HANDLERS = {
+    amd64: new Amd64DocumentationHandler(),
+    arm32: new Arm32DocumentationHandler(),
+    java: new JavaDocumentationHandler(),
+    6502: new Mos6502DocumentationHandler(),
+};
+
+const MAX_STATIC_AGE = propsFor('asm-docs')('staticMaxAgeSecs', 10);
+
+/**
+ * Initialize all Assembly Docs routes
+ *
+ * @param {e.Router} router
+ */
+export const setup = (router) => router.get('/asm/:arch/:opcode', (req, res) => {
+    if (MAX_STATIC_AGE > 0) {
+        res.setHeader('Cache-Control', `public, max-age=${MAX_STATIC_AGE}`);
+    }
+    const architecture = req.params.arch;
+    const handler = ASSEMBLY_DOCUMENTATION_HANDLERS[architecture];
+    if (handler !== undefined) {
+        return handler.handle(req, res);
+    }
+    res.status(404).json({ error: `No documentation for '${architecture}'` }).send();
+});