Add extracted source directory and README navigation

extracted-source/node_modules/@smithy/middleware-content-length/dist-cjs/index.js

@@ -0,0 +1,46 @@
+'use strict';
+
+var protocolHttp = require('@smithy/protocol-http');
+
+const CONTENT_LENGTH_HEADER = "content-length";
+function contentLengthMiddleware(bodyLengthChecker) {
+    return (next) => async (args) => {
+        const request = args.request;
+        if (protocolHttp.HttpRequest.isInstance(request)) {
+            const { body, headers } = request;
+            if (body &&
+                Object.keys(headers)
+                    .map((str) => str.toLowerCase())
+                    .indexOf(CONTENT_LENGTH_HEADER) === -1) {
+                try {
+                    const length = bodyLengthChecker(body);
+                    request.headers = {
+                        ...request.headers,
+                        [CONTENT_LENGTH_HEADER]: String(length),
+                    };
+                }
+                catch (error) {
+                }
+            }
+        }
+        return next({
+            ...args,
+            request,
+        });
+    };
+}
+const contentLengthMiddlewareOptions = {
+    step: "build",
+    tags: ["SET_CONTENT_LENGTH", "CONTENT_LENGTH"],
+    name: "contentLengthMiddleware",
+    override: true,
+};
+const getContentLengthPlugin = (options) => ({
+    applyToStack: (clientStack) => {
+        clientStack.add(contentLengthMiddleware(options.bodyLengthChecker), contentLengthMiddlewareOptions);
+    },
+});
+
+exports.contentLengthMiddleware = contentLengthMiddleware;
+exports.contentLengthMiddlewareOptions = contentLengthMiddlewareOptions;
+exports.getContentLengthPlugin = getContentLengthPlugin;