Fix use of deprecated Buffer.slice method

Author: pimterry

src/util/buffer-utils.ts

@@ -151,8 +151,8 @@ export function splitBuffer(input: Buffer, splitter: string, maxParts = Infinity
         let endOfPart = remainingBuffer.indexOf(splitter);
         if (endOfPart === -1) endOfPart = remainingBuffer.length;
 
-        parts.push(remainingBuffer.slice(0, endOfPart));
-        remainingBuffer = remainingBuffer.slice(endOfPart + splitter.length);
+        parts.push(remainingBuffer.subarray(0, endOfPart));
+        remainingBuffer = remainingBuffer.subarray(endOfPart + splitter.length);
 
         if (parts.length === maxParts - 1) {
             parts.push(remainingBuffer);

src/util/request-utils.ts

@@ -514,7 +514,7 @@ export function tryToParseHttpRequest(input: Buffer, socket: net.Socket): Partia
             : undefined;
 
         const lines = splitBuffer(input, '\r\n');
-        const requestLine = lines[0].slice(0, lines[0].length).toString('ascii');
+        const requestLine = lines[0].subarray(0, lines[0].length).toString('ascii');
         const [method, rawUri, httpProtocol] = requestLine.split(" ");
 
         if (method) req.method = method.slice(0, 15); // With overflows this could be *anything*. Limit it slightly.