Add several constants

deno/content-types.ts

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+import { Extensible } from "./interfaces";
+
+const contentTypes: Extensible = {
+    text: {
+        plain: "text/plain",
+        html: "text/html",
+        css: "text/css",
+        javascript: "text/javascript",
+        xml: "text/xml",
+    },
+    image: {
+        jpeg: "image/jpeg",
+        png: "image/png",
+        gif: "image/gif",
+        svgPlusXml: "image/svg+xml",
+        webp: "image/webp",
+    },
+    audio: {
+        "mpeg": "audio/mpeg",
+        "wav": "audio/wav",
+    },
+    video: {
+        mp4: "video/mp4",
+        webm: "video/webm",
+        xMsvideo: "video/x-msvideo",
+    },
+    application: {
+        json: "application/json",
+        pdf: "application/pdf",
+        zip: "application/zip",
+        xWwwFormUrlencoded: "x-www-form-urlencoded",
+        octetStream: "octet-stream",
+    },
+};
+
+export { contentTypes };

deno/http-codes.ts

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+import { Extensible } from "./interfaces";
+
+type HttpCode = {
+    code: number;
+    name: string;
+    description?: string;
+};
+type Group = "success" | "redirection" | "clientErrors" | "serverErrors";
+type CodeDefinitions = {
+    [K in Group]: {
+        [K: string]: HttpCode;
+    };
+};
+
+const httpCodes: CodeDefinitions & Extensible = {
+    success: {
+        OK: { code: 200, name: "OK", "description": "" },
+        Created: { code: 201, name: "Created" },
+        Accepted: { code: 202, name: "Accepted" },
+        NoContent: { code: 204, name: "No content" },
+    },
+    redirection: {
+        // later
+    },
+    clientErrors: {
+        BadRequest: { code: 400, name: "Bad Request" },
+        Unauthorized: { code: 401, name: "Unauthorized" },
+        Forbidden: { code: 403, name: "Forbidden" },
+        NotFound: { code: 404, name: "Not Found" },
+        MethodNotAllowed: { code: 405, name: "Method Not Allowed" },
+        NotAcceptable: { code: 406, name: "Not Acceptable" },
+        // More later
+    },
+    serverErrors: {
+        InternalServerError: { code: 500, name: "Internal Server Error" },
+        NotImplemented: { code: 500, name: "Not implemented" },
+        // more later
+    },
+};
+
+export { httpCodes };

deno/interfaces.ts

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+export interface Extensible {}