src/hero.mjs: Add buildHttpPayload()

1 files changed, 19 insertions, 0 deletions

diff --git a/src/hero.mjs b/src/hero.mjs
index a9397ef..daf8141 100644
--- a/src/hero.mjs
+++ b/src/hero.mjs
@@ -285,6 +285,25 @@ export const emitHeaders = obj =>
 		.map(name => `${name}: ${obj[name]}`)
 		.join("\r\n");
 
+const STATUS_CODES = {
+	404: "Not Found",
+	405: "Method Not Allowed",
+};
+
+export const buildHttpPayload = (code, {
+	headers = {},
+	message = `${STATUS_CODES[code]}\n`,
+} = {}) =>
+	`HTTP/1.1 ${code} ${STATUS_CODES[code]}\r\n` +
+	emitHeaders({
+		"Connection": "close",
+		"Content-Type": "text/plain; charset=UTF-8",
+		"Content-Length": Buffer.byteLength(message),
+		...headers,
+	}) +
+	"\r\n\r\n" +
+	message;
+
 export const makeRequestListener = table => async (req, res) => {
 	const { status, headers, body } = await handleRequest(table, req);
 	res.writeHead(status, headers);