Fix UTF-8 String len & DELETE Request Body

sdk/core/core-rest-pipeline/src/nodeHttpClient.ts

@@ -300,7 +300,7 @@ function streamToText(stream: NodeJS.ReadableStream): Promise<string> {
   });
 }
 
-function getBodyLength(body: RequestBodyType): number | null {
+export function getBodyLength(body: RequestBodyType): number | null {
   if (!body) {
     return 0;
   } else if (Buffer.isBuffer(body)) {
@@ -309,6 +309,8 @@ function getBodyLength(body: RequestBodyType): number | null {
     return null;
   } else if (isArrayBuffer(body)) {
     return body.byteLength;
+  } else if (typeof body === "string") {
+    return Buffer.from(body).length;
   } else {
     return null;
   }

sdk/core/core-rest-pipeline/src/policies/redirectPolicy.ts

@@ -66,6 +66,7 @@ async function handleRedirect(
     // redirected GET request if the redirect url is present in the location header
     if (status === 303) {
       request.method = "GET";
+      request.headers.delete("Content-Length");
       delete request.body;
     }
 

sdk/core/core-rest-pipeline/test/node/getBodyLength.spec.ts

@@ -0,0 +1,18 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+
+import { assert } from "chai";
+import { getBodyLength } from "../../src/nodeHttpClient";
+
+describe("Get Body Length", function() {
+  it("Gets the length of the ASCII string correctly", function() {
+    const str: string = "true";
+    assert.equal(getBodyLength(str), 4);
+  });
+
+  it("Gets the length of the non-ASCII string correctly", function() {
+    const str: string =
+      "啊齄丂狛狜隣郎隣兀﨩ˊ〞〡￤℡㈱‐ー﹡﹢﹫、〓ⅰⅹ⒈€㈠㈩ⅠⅫ！￣ぁんァヶΑ︴АЯаяāɡㄅㄩ─╋︵﹄︻︱︳︴ⅰⅹɑɡ〇〾⿻⺁䜣€";
+    assert.equal(getBodyLength(str), 194);
+  });
+});