Introduction to Nginx + Lua (suitable for beginners)

Win download address: http://code.google.com/p/luaforwindows/

Hello Lua

Nginx uses content_by_lua and content_by_lua_file to embed the lua script.

Content_by_lua

Modify nginx configuration file nginx. conf

Location/hellolua {
Content_by_lua'
Ngx. header. content_type = "text/html ";
Ngx. say ("Hello Lua .");
';
}

Restart nginx to access http: // localhost // hellolua. You can see Hello Lua.

Content_by_lua_file

Location/demo {
Lua_code_cache off;
Content_by_lua_file lua_script/demo. lua;
}

Lua_code_cache indicates that the cache is disabled. When the cache is disabled, you do not need to restart nginx to modify the lua script. Content_by_lua_file specifies the script path. This is the relative path, relative to the nginx root directory, and then write the following lua script

-- Filename: demo. lua
Ngx. header. content_type = "text/html"
Ngx. say ("Hello Lua Demo .")
Restart Nginx and turn off lua_code_cache. Then nginx will have an alert.

Nginx: [alert] lua_code_cache is off; this will hurt performance in./conf/nginx. conf: 56

Visit http: // localhost/demo to see Hello Lua Demo.

Obtain common Nginx parameters

Ngx. header. content_type = "text/html"
Ngx. header. PowerBy = "Lua"
-- Request header table
For k, v in pairs (ngx. req. get_headers () do
Ngx. say (k, ":", v)
End
 
-- Request methods such as GET and POST
Ngx. say ("METHOD:"... ngx. var. request_method)
 
-- GET parameters
For k, v in pairs (ngx. req. get_uri_args () do
Ngx. say (k, ":", v)
End
 
 
-- Get POST parameters
Ngx. req. read_body ()
For k, v in pairs (ngx. req. get_post_args () do
Ngx. say (k, ":", v)
End
 
-- HTTP version
Ngx. say (ngx. req. http_version ())
 
-- Unparsed request header string
Ngx. say (ngx. req. raw_header ())
 
-- Unparsed BODY string
Ngx. print (ngx. req. get_body_data ())
 
-- Ngx. exit (400)
-- Ngx. redirect ("/", 200)

MD5 example

The following is a small example to generate the md5 value of the string.

Ngx. header. content_type = "text/html"
Local resty_md5 = require "resty. md5"
Local md5 = resty_md5: new ()
 
Local s = "Hello Lua ."
Md5: update (s)
Local str = require "resty. string"
Ngx. say (str. to_hex (md5: final ()))
 
Ngx. say (ngx. md5 (s ))