在我的Ubuntu Server 10.04中,我正在运行一个示例node.js应用程序:
var http = require("http");
function onRequest(request, response) {
console.log("Request received.");
response.writeHead(200, {"Content-Type": "text/html"});
response.write("Hello World");
response.end();
}
http.createServer(onRequest).listen(3000);
它只是侦听端口3000上的请求,登录控制台此请求,然后向客户端发送HTTP “ Hello World”
目的是使该应用程序与Apache2共存。因此,经过一些研究,我以这种方式编辑了默认文件(/ etc / apache2 / sites-available / default):
<VirtualHost *:80>
ServerAdmin haj@myserver.com
ServerName dev.myserver.com
<Location /node>
ProxyPassReverse http://127.0.0.1:3000/
ProxyPass http://127.0.0.1:3000/
</Location>
<Proxy>
Allow from all
</Proxy>
DocumentRoot /home/haj/www/http_home
<Directory />
Options FollowSymLinks
AllowOverride None
</Directory>
<Directory /home/haj/www/http_home/>
Options Indexes FollowSymLinks MultiViews
AllowOverride None
Order allow,deny
allow from all
</Directory>
ErrorLog /home/haj/www/log/error.log
# Possible values include: debug, info, notice, warn, error, crit,
# alert, emerg.
LogLevel warn
CustomLog /home/haj/www/log/access.log combined
</VirtualHost>
因此,当用户调用http://dev.myserver.com/node
或时http://dev.myserver.com/node/
,Apache代理该请求,Node.js进行处理,然后用户返回“ Hello World”。
只有一个问题:需要一些时间,我们称它为“加载”代理,换句话说,我在浏览器中收到了以下消息:
<503 Service Temporarily Unavailable>
Service Temporarily Unavailable
The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.
Apache/2.2.14 (Ubuntu) Server at dev.neosource.cl Port 80
此外,error.log告诉我:
[Thu Apr 21 01:02:10 2011] [error] proxy: HTTP: disabled connection for (127.0.0.1)
[Thu Apr 21 01:02:10 2011] [error] proxy: HTTP: disabled connection for (127.0.0.1)
[Thu Apr 21 01:02:10 2011] [error] proxy: HTTP: disabled connection for (127.0.0.1)
然后突然,它起作用了,就像那样。没有数量的请求,没有时间,根本没有模式。
用外行的话来说,服务必须“加载”,这就是它给人的印象,但是,我想知道是否有一种方法可以最大程度地减少这种延迟。或者,我宁愿知道上述配置出了什么问题。
编辑1:将LogLevel修改为调试后,在这些延迟之一中,我收到了每个请求:
[Thu Apr 21 02:30:40 2011] [debug] mod_proxy_http.c(56): proxy: HTTP: canonicalising URL //127.0.0.1:3000/
[Thu Apr 21 02:30:40 2011] [debug] proxy_util.c(1494): [client 200.xxx.yyy.zzz] proxy: http: found worker http://127.0.0.1:3000/ for http://127.0.0.1:3000/
[Thu Apr 21 02:30:40 2011] [debug] mod_proxy.c(993): Running scheme http handler (attempt 0)
[Thu Apr 21 02:30:40 2011] [debug] mod_proxy_http.c(1940): proxy: HTTP: serving URL http://127.0.0.1:3000/
[Thu Apr 21 02:30:40 2011] [debug] proxy_util.c(1937): proxy: HTTP: retrying the worker for (127.0.0.1)
[Thu Apr 21 02:30:40 2011] [error] proxy: HTTP: disabled connection for (127.0.0.1)
[Thu Apr 21 02:30:40 2011] [debug] mod_deflate.c(615): [client 200.xxx.yyy.zzz] Zlib: Compressed 405 to 273 : URL /node
...然后再次正确:
[Thu Apr 21 02:35:16 2011] [debug] mod_proxy_http.c(56): proxy: HTTP: canonicalising URL //127.0.0.1:3000/
[Thu Apr 21 02:35:16 2011] [debug] proxy_util.c(1494): [client 200.xxx.yyy.zzz] proxy: http: found worker http://127.0.0.1:3000/ for http://127.0.0.1:3000/
[Thu Apr 21 02:35:16 2011] [debug] mod_proxy.c(993): Running scheme http handler (attempt 0)
[Thu Apr 21 02:35:16 2011] [debug] mod_proxy_http.c(1940): proxy: HTTP: serving URL http://127.0.0.1:3000/
[Thu Apr 21 02:35:16 2011] [debug] proxy_util.c(1999): proxy: HTTP: has acquired connection for (127.0.0.1)
[Thu Apr 21 02:35:16 2011] [debug] proxy_util.c(2055): proxy: connecting http://127.0.0.1:3000/ to 127.0.0.1:3000
[Thu Apr 21 02:35:16 2011] [debug] proxy_util.c(2153): proxy: connected / to 127.0.0.1:3000
[Thu Apr 21 02:35:16 2011] [debug] proxy_util.c(2244): proxy: HTTP: backend socket is disconnected.
[Thu Apr 21 02:35:16 2011] [debug] proxy_util.c(2308): proxy: HTTP: fam 2 socket created to connect to 127.0.0.1
[Thu Apr 21 02:35:16 2011] [debug] proxy_util.c(2414): proxy: HTTP: connection complete to 127.0.0.1:3000 (127.0.0.1)
[Thu Apr 21 02:35:16 2011] [debug] mod_proxy_http.c(1723): proxy: start body send
[Thu Apr 21 02:35:16 2011] [debug] mod_deflate.c(615): [client 200.xxx.yyy.zzz] Zlib: Compressed 11 to 13 : URL /node
[Thu Apr 21 02:35:16 2011] [debug] mod_proxy_http.c(1816): proxy: end body send
[Thu Apr 21 02:35:16 2011] [debug] proxy_util.c(2017): proxy: HTTP: has released connection for (127.0.0.1)