call tostring on plain object body

index.js

@@ -229,6 +229,7 @@ function Fetch(url, opts) {
 		});
 
 		// accept string, buffer or readable stream as body
+		// per spec we will call tostring on non-stream objects
 		if (typeof options.body === 'string') {
 			req.write(options.body);
 			req.end();
@@ -237,6 +238,9 @@ function Fetch(url, opts) {
 			req.end()
 		} else if (typeof options.body === 'object' && options.body.pipe) {
 			options.body.pipe(req);
+		} else if (typeof options.body === 'object') {
+			req.write(options.body.toString());
+			req.end();
 		} else {
 			req.end();
 		}

test/test.js

@@ -727,6 +727,21 @@ describe('node-fetch', function() {
 		});
 	});
 
+	it('should allow POST request with object body', function() {
+		url = base + '/inspect';
+		// note that fetch simply calls tostring on an object
+		opts = {
+			method: 'POST'
+			, body: { a:1 }
+		};
+		return fetch(url, opts).then(function(res) {
+			return res.json();
+		}).then(function(res) {
+			expect(res.method).to.equal('POST');
+			expect(res.body).to.equal('[object Object]');
+		});
+	});
+
 	it('should allow PUT request', function() {
 		url = base + '/inspect';
 		opts = {