nginx,hello World!

时间:2021-09-09 19:40:02

 向nginx中添加第一个最简单的hello world模块

一、编写ngx_http_mytest_module模块

1. ngx_http_mytest_module.c

 #include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h> //mytest module define static ngx_int_t ngx_http_mytest_handler(ngx_http_request_t* r)
{
//不是GET或者HEAD方法,返回405
if (!(r->method & (NGX_HTTP_GET | NGX_HTTP_HEAD))){
return NGX_HTTP_NOT_ALLOWED;
}
//忽略接收到的包体
ngx_int_t rc = ngx_http_discard_request_body(r);
if (rc != NGX_OK)
return rc; //设置响应头
ngx_str_t type = ngx_string("text/plain");
ngx_str_t response = ngx_string("Hello World!");
//设置http状态码
r->headers_out.status = NGX_HTTP_OK;
//设置响应Content-Type
r->headers_out.content_length_n = response.len;
r->headers_out.content_type = type; //发送响应头
rc = ngx_http_send_header(r);
if (rc == NGX_ERROR || rc > NGX_OK || r->header_only)
return rc; //设置响应内容
ngx_buf_t* b;
b = ngx_create_temp_buf(r->pool, response.len);
if (b == NULL)
return NGX_HTTP_INTERNAL_SERVER_ERROR;
ngx_memcpy(b->pos, response.data, response.len);
b->last = b->pos + response.len;
b->last_buf = ; //设置响应内容到chain中
ngx_chain_t out;
out.buf = b;
out.next = NULL; return ngx_http_output_filter(r, &out);
} //set handler
static char* ngx_http_mytest(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_mytest_handler;
return NGX_CONF_OK;
} //conf structure
static ngx_command_t ngx_http_mytest_commands[] =
{
{
ngx_string("mytest"),
NGX_HTTP_MAIN_CONF | NGX_HTTP_SRV_CONF | NGX_HTTP_LOC_CONF |
NGX_HTTP_LMT_CONF | NGX_CONF_NOARGS,
ngx_http_mytest,
NGX_HTTP_LOC_CONF_OFFSET,
,
NULL
},
ngx_null_command
}; //module ctx
static ngx_http_module_t ngx_http_mytest_module_ctx = { NULL, NULL, NULL, NULL, NULL, NULL,NULL, NULL}; //mytest module
ngx_module_t ngx_http_mytest_module = {
NGX_MODULE_V1,
&ngx_http_mytest_module_ctx,
ngx_http_mytest_commands,
NGX_HTTP_MODULE,
NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NGX_MODULE_V1_PADDING
};

ngx_http_mytest_module.c

2.config

 ngx_addon_name=ngx_http_mytest_module
HTTP_MODULES="$HTTP_MODULES ngx_http_mytest_module"
NGX_ADDON_SRCS="$NGX_ADDON_SRCS $ngx_addon_dir/ngx_http_mytest_module.c"

config

二、安装nginx

 ./configure --prefix=/usr/local/nginx  --add-module=/usr/local/src/ngx-mytest-module/

三、修改配置文件

 location /test {
mytest;
}

四、启动nginx,并通过浏览器访问

nginx,hello World!

五、查看日志文件

nginx,hello World!

倒数第二行对/test的响应。

六、对过程一些问题的总结

1. 执行configure后,objs文件夹下ngx_modules.c文件中只有3部分:

  1)extern模块

  nginx,hello World!

  2)ngx_modules数组

  nginx,hello World!

  nginx,hello World!

  3)ngx_module_names数组

  nginx,hello World!

2. nginx自定义模块需要添加的头文件

  nginx,hello World!

3. 如果主机不能访问虚拟机web服务器,可能是需要关闭防火墙

 iptables -F
iptables -P INPUT ACCEPT