perf: latin1 (#2075)

lib/client.js

@@ -1451,17 +1451,17 @@ function write (client, request) {
   /* istanbul ignore else: assertion */
   if (!body) {
     if (contentLength === 0) {
-      socket.write(`${header}content-length: 0\r\n\r\n`, 'ascii')
+      socket.write(`${header}content-length: 0\r\n\r\n`, 'latin1')
     } else {
       assert(contentLength === null, 'no body must not have content length')
-      socket.write(`${header}\r\n`, 'ascii')
+      socket.write(`${header}\r\n`, 'latin1')
     }
     request.onRequestSent()
   } else if (util.isBuffer(body)) {
     assert(contentLength === body.byteLength, 'buffer body must have content length')
 
     socket.cork()
-    socket.write(`${header}content-length: ${contentLength}\r\n\r\n`, 'ascii')
+    socket.write(`${header}content-length: ${contentLength}\r\n\r\n`, 'latin1')
     socket.write(body)
     socket.uncork()
     request.onBodySent(body)
@@ -1576,7 +1576,7 @@ async function writeBlob ({ body, client, request, socket, contentLength, header
     const buffer = Buffer.from(await body.arrayBuffer())
 
     socket.cork()
-    socket.write(`${header}content-length: ${contentLength}\r\n\r\n`, 'ascii')
+    socket.write(`${header}content-length: ${contentLength}\r\n\r\n`, 'latin1')
     socket.write(buffer)
     socket.uncork()
 
@@ -1688,14 +1688,14 @@ class AsyncWriter {
       }
 
       if (contentLength === null) {
-        socket.write(`${header}transfer-encoding: chunked\r\n`, 'ascii')
+        socket.write(`${header}transfer-encoding: chunked\r\n`, 'latin1')
       } else {
-        socket.write(`${header}content-length: ${contentLength}\r\n\r\n`, 'ascii')
+        socket.write(`${header}content-length: ${contentLength}\r\n\r\n`, 'latin1')
       }
     }
 
     if (contentLength === null) {
-      socket.write(`\r\n${len.toString(16)}\r\n`, 'ascii')
+      socket.write(`\r\n${len.toString(16)}\r\n`, 'latin1')
     }
 
     this.bytesWritten += len
@@ -1739,12 +1739,12 @@ class AsyncWriter {
         // no Transfer-Encoding is sent and the request method defines a meaning
         // for an enclosed payload body.
 
-        socket.write(`${header}content-length: 0\r\n\r\n`, 'ascii')
+        socket.write(`${header}content-length: 0\r\n\r\n`, 'latin1')
       } else {
-        socket.write(`${header}\r\n`, 'ascii')
+        socket.write(`${header}\r\n`, 'latin1')
       }
     } else if (contentLength === null) {
-      socket.write('\r\n0\r\n\r\n', 'ascii')
+      socket.write('\r\n0\r\n\r\n', 'latin1')
     }
 
     if (contentLength !== null && bytesWritten !== contentLength) {