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This article mainly explains "how to use nginscript," interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let Xiaobian take you to learn "how to use nginscript"!

Nginx can do the following:

1, work in the seventh layer of TCP, can analyze and process all the contents of the HTTP protocol.

2, Support lua, perl, javascript dynamic language

3. Support third-party plug-ins

Let's talk about NginScript.

Nginscript is a subset of JavaScript/ECMAScript. It implements most of javascript's capabilities, does not fully comply with ecmascript standards, and discards the more obscure parts of javascript.

Nginscript is not implemented via the V8 engine. Instead, it is implemented by a smaller, less power-intensive virtual machine (vm) that is more in line with the nginx application scenario. It can be understood that nginx implements its own set of lexical parsing.

Nginscript runs in the nginx configuration file. For example: nginx.conf file. So nginscript can do everything a traditional configuration file can do, while making configuration management dynamic. This is also the most important reason for the appearance of nginscript.

Nginscript exists as an nginx plugin. Plugin name: njs. As with other nginx plugins, we need to recompile nginx to complete the installation.

Nginscript is currently in an early stage of development. You can communicate with the nginx team by email and make your appeal.

How to install nginscript

Here, just follow the official steps:

// 1. Download the latest nginx package, see: wget //2. Unzip tar -xzvf nginx-1.9.4.tar.gz//3. Get nginscript module through mercurial. If mercurial is not installed here, you need to run yum install mercurial hg clone first.

//4, compile nginx, here only the specific njs module, other modules you need to remember to install together. If you haven't compiled nginx, some dependent modules need yum installation, please search for them yourself. cd nginx-1.9.4 ./ configure --add-module=../ njs/nginx --prefix=/usr/local make make install ok, This installation is finished, We can start playing.

How to use nginscript

The use of nginscript is mainly due to the addition of two directives to the nginx configuration system. Specific instructions are:

js_set, setting variable values in the configuration

js_run, directly execute configuration rules

Let's see how js_set works in nginx.conf.

http { js_set $msg" var str = 'hello,imweb'; // javascript str; "; server { ... location /{ return 200 $msg; } }}

Results:

In the above example, we can see that we can set variable values to nginx at will through js. These variables can be used anywhere in the nginx configuration. For example: proxy_pass,limit_req_zone, and sub_filter. This has greatly increased flexibility compared to previous configurations.

2. Running rules and scenarios of js_run

js_run is run in the location command, matching the path of the specified location will execute the corresponding javascript

js_run is directly through javascript to generate http return content

Here's a concrete example:

location /imwebteam { js_run " var res; res = $r.response; res.status = 200; res.send('hello,imweb! '); res.finish(); ";}

This result is the same as the first result. I won't repeat it here.

In addition to processing two instructions, there is an important variable $r

Js_set and js_run allow complete control over http request requests through the use of the variable $r. What is in $r can be seen in the following simple example.

http { js_set $summary " var a, s, h; s = 'js summary\n\n'; s += 'method: ' + $r.method + '\n'; s += 'http version: ' + $r.httpversion + '\n'; s += 'host: ' + $r.headers.host + '\n'; s += 'remote address: ' + $r.remoteaddress + '\n'; s += 'uri: ' + $r.uri + '\n'; s += 'headers:\n'; for (h in $r.headers) { s += ' header \"' + h + '\" is \"' + $r.headers[h] + '\"\n'; } s += 'args:\n'; for (a in $r.args) { s += ' arg \"' + a + '\" is \"' + $r.args[a] + '\"\n'; } s; "; server { listen 8000; location /imwebteam{ return 200 $summary; }}

The results are as follows:

At this point, I believe everyone has a deeper understanding of "how to use nginscript," so let's actually operate it! Here is the website, more related content can enter the relevant channels for inquiry, pay attention to us, continue to learn!

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