Nginx version of "HelloWorld"

Nginx Module Overview

Nginx modules cannot be added dynamically like Apache, and all modules are pre-compiled into Nginx binaries.
The Nginx module has three roles:
(1) Handlers (processing module) – Used to process HTTP requests and output content.
(2) Filters (Filter module) – Used to filter the contents of the Headler output.
(3) load-balancers (Load balancer module) – When multiple servers are available, select a back-end server and forward the HTTP request to the server.

Hello World Module Authoring and installation

(1) Execute the following command to write our Nginx module within the directory:
mkdir-p/opt/nginx_hello_world
Cd/opt/nginx_hello_world
(2) The configuration file required to create the Nginx module (named config) is started
Vim/opt/nginx_hello_world
Then enter the following to save and exit:

ngx_sddon_name=nginx_http_hello_world_moduleHTTP_MODULES="$HTTP_MODULES ngx_http_hello_world_module"NGX_ADDON_SRCS="$NGX_ADDON_SRCS $ngx_addon_dir/ngx_http_hello_world_module.c"CORE_LIBS="$CORE_LIBS -lpcre"

(3) Create Nginx module C program file (in the format "NGX_HTTP_ module name _module.c", in this case: NGX_HTTP_HELLO_WORLD_MODULE.C)
Vim/opt/nginx_hello_world/ngx_http_hello_world_module.c

#include <ngx_config.h>#include <ngx_core.h>#include <ngx_http.h>Static Char*ngx_http_hello_world (ngx_conf_t *cf,ngx_command_t *cmd,void*CONF);Staticngx_command_t ngx_http_hello_world_commands[]={{ngx_string ("Hello_world"), ngx_http_loc_conf| Ngx_conf_noargs,ngx_http_hello_world,0,0,NULL},ngx_null_command};StaticU_char ngx_hello_world[]="Hello World";Staticngx_http_module_t Ngx_http_hello_world_module_ctx ={NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL};ngx_module_t Ngx_http_hello_world_module ={ngx_module_v1,&ngx_http_hello_world_module_ctx,ngx_http_hello_ World_commands,ngx_http_module,NULL,NULL,NULL,NULL,NULL,NULL,NULL, ngx_module_v1_padding};Staticngx_int_t Ngx_http_hello_world_handler (ngx_http_request_t *r) {ngx_buf_t *b;ngx_chain_t out;r->headers_out. Content_Type. Len=sizeof("Text/plain") -1; r->headers_out. Content_Type. Data= (U_char *)"Text/plain"; b= Ngx_pcalloc (R->pool,sizeof(ngx_buf_t)); O Ut. BUF=b;out. Next=NULL; B->pos=ngx_hello_world;b->last =ngx_hello_world +sizeof(ngx_hello_world); b->memory =1; b->last_buf =1; r->headers_out. Status= Ngx_http_ok;r->headers_out. Content_length_n=sizeof(Ngx_hello_world); Ngx_http_send_header (R);returnNgx_http_output_filter (r,&out);}Static Char*ngx_http_hello_world (ngx_conf_t *cf,ngx_command_t *cmd,void*conf) {ngx_http_core_loc_conf_t *CLCF;CLCF = ngx_http_conf_get_module_loc_conf (cf, Ngx_http_core_module);clcf-> handler = Ngx_http_hello_world_handler;returnNGX_CONF_OK;}

(4) Refer to my Nginx installation that a Nginx installation blog in this step slightly different
**./configure–prefix=/usr/local/nginx–add-module=/opt/nginx_hello_world
Make&&make install**
(5) Configure nginx.conf (/usr/local/nginx/conf/nginx.conf) to add the following in the server section:
**location =/hello{
Hello_world;
}**
(6) Start Nginx, (Nginx start), with a browser access to Http://localhost/hello, you can see the written nginx Hello World module output text "Hello World".

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Nginx version of "HelloWorld"