Description
Node.js appears to be configured to print noisy debug output from http2 to stderr, and there is no way to suppress these messages. I originally filed this bug as googleapis/nodejs-logging#668, and was pointed to NodeSource, where I filed nodesource/distributions#995, and they ultimately pointed me here, which is why I'm filing this issue.
Steps to reproduce:
Install Node.js 10.x on Centos 8 from the NodeSource repository (consider starting from a cleanroom environment like the centos:centos8 dockerhub image):
$ curl -sL https://rpm.nodesource.com/setup_10.x | bash -
$ sudo yum install -y nodejsNote: this also reproduces on the 12.x stream, and according to nodesource/distributions#995 (comment), this also reproduces in other builds of Node.js, not just NodeSource.
Run the following Node.js program from googleapis/nodejs-logging#668 (comment):
const http2 = require('http2');
const client = http2.connect('https://www.google.com');
client.on('error', (err) => console.error(err));
const req = client.request({ ':path': '/' });
req.on('response', (headers, flags) => {
for (const name in headers) {
console.log(`${name}: ${headers[name]}`);
}
});
req.setEncoding('utf8');
let data = '';
req.on('data', (chunk) => { data += chunk; });
req.on('end', () => {
console.log(`\nReceived ${data.length} bytes of data.`);
client.close();
});
req.end();Expected: There should be nothing logged to standard error.
Actual: A lot of messages are printed, such as:
send: reset nghttp2_active_outbound_item
send: aob->item = (nil)
stream: adjusting kept idle streams num_idle_streams=0, max=100
stream: adjusting kept idle streams num_idle_streams=0, max=100
send: end transmission of client magic
send: reset nghttp2_active_outbound_item
send: aob->item = (nil)
send: next frame: payloadlen=0, type=4, flags=0x00, stream_id=0
send: start transmitting frame type=4, length=9
stream: adjusting kept idle streams num_idle_streams=0, max=100
send: end transmission of a frame
send: reset nghttp2_active_outbound_item
send: aob->item = 0x5652b4afcfc8
stream: dep_add dep_stream(0x5652b4af38b8)=0, stream(0x5652b4af2f28)=1
deflatehd: deflating :scheme: https
deflatehd: name/value match index=6
deflatehd: emit indexed index=6, 1 bytes
deflatehd: deflating :authority: www.google.com:443
deflatehd: name match index=0
...
inflatehd: 11 bytes read
inflatehd: header emission: vary: Accept-Encoding
recv: proclen=13
inflatehd: start state=2
inflatehd: all input bytes were processed
inflatehd: in_final set
recv: proclen=0
stream: adjusting kept idle streams num_idle_streams=0, max=100
recv: connection recv_window_size=0, local_window=65535
...
recv: [IB_READ_HEAD]
recv: payloadlen=8, type=6, flags=0x00, stream_id=0
recv: PING
recv: [IB_READ_NBYTE]
recv: readlen=8, payloadleft=0, left=0
send: reset nghttp2_active_outbound_item
send: aob->item = (nil)
System info:
[sffc@oo-back6t ~]$ node -v
v10.16.3
[sffc@oo-back6t ~]$ uname -a
Linux oo-back6t 4.18.0-80.11.2.el8_0.x86_64 #1 SMP Tue Sep 24 11:32:19 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
[sffc@oo-back6t ~]$ sudo yum info nodejs
Last metadata expiration check: 2:27:35 ago on Thu 13 Feb 2020 04:24:37 AM UTC.
Installed Packages
Name : nodejs
Epoch : 1
Version : 10.16.3
Release : 2.module_el8.0.0+186+542b25fc
Arch : x86_64
Size : 44 M
Source : nodejs-10.16.3-2.module_el8.0.0+186+542b25fc.src.rpm
Repo : @System
From repo : AppStream
Summary : JavaScript runtime
URL : http://nodejs.org/
License : MIT and ASL 2.0 and ISC and BSD
Description : Node.js is a platform built on Chrome's JavaScript runtime
: for easily building fast, scalable network applications.
: Node.js uses an event-driven, non-blocking I/O model that
: makes it lightweight and efficient, perfect for data-intensive
: real-time applications that run across distributed devices.