HEAD request does not need to process body with decompression

index.js

@@ -166,7 +166,8 @@ function Fetch(url, opts) {
 			var body = res.pipe(new stream.PassThrough());
 			var headers = new Headers(res.headers);
 
-			if (options.compress && headers.has('content-encoding')) {
+			// HEAD request is ignored
+			if (options.compress && options.method !== 'HEAD' && headers.has('content-encoding')) {
 				var name = headers.get('content-encoding');
 
 				// no need to pipe no content and not modified response body

test/server.js

@@ -248,6 +248,12 @@ TestServer.prototype.router = function(req, res) {
 		res.end('client error');
 	}
 
+	if (p === '/error/404') {
+		res.statusCode = 404;
+		res.setHeader('Content-Encoding', 'gzip');
+		res.end();
+	}
+
 	if (p === '/error/500') {
 		res.statusCode = 500;
 		res.setHeader('Content-Type', 'text/plain');

test/test.js

@@ -771,6 +771,23 @@ describe('node-fetch', function() {
 			expect(res.statusText).to.equal('OK');
 			expect(res.headers.get('content-type')).to.equal('text/plain');
 			expect(res.body).to.be.an.instanceof(stream.Transform);
+			return res.text();
+		}).then(function(text) {
+			expect(text).to.equal('');
+		});
+	});
+
+	it('should allow HEAD request with content-encoding header', function() {
+		url = base + '/error/404';
+		opts = {
+			method: 'HEAD'
+		};
+		return fetch(url, opts).then(function(res) {
+			expect(res.status).to.equal(404);
+			expect(res.headers.get('content-encoding')).to.equal('gzip');
+			return res.text();
+		}).then(function(text) {
+			expect(text).to.equal('');
 		});
 	});