【Nginx】第一个程序Hello World

location /test {
    mytest;
}

#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
 
static ngx_int_t ngx_http_mytest_handler(ngx_http_request_t *r);
static char * 
ngx_http_mytest(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
//处理配置项
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,
        0,
        NULL
    },
    ngx_null_command
};
//模块上下文
static ngx_http_module_t ngx_http_mytest_module_ctx = {
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL
};
//新模块定义
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
};
 
//配置项对应的回调函数
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;
}
 
//实际完成处理的回调函数
static ngx_int_t ngx_http_mytest_handler(ngx_http_request_t *r)
{
    if (!(r->method & (NGX_HTTP_GET | NGX_HTTP_HEAD))) {
        return NGX_HTTP_NOT_ALLOWED;
    }
 
    ngx_int_t rc = ngx_http_discard_request_body(r);
    if (rc != NGX_OK) {
        return rc;
    }
 
    ngx_str_t type = ngx_string("text/plain");
    ngx_str_t response = ngx_string("Hello World");
    r->headers_out.status = NGX_HTTP_OK;
    r->headers_out.content_length_n = response.len;
    r->headers_out.content_type = type;
 
    rc = ngx_http_send_header(r);
    if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) {
        return rc;
    }
 
    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 = 1;
 
    ngx_chain_t out;
    out.buf = b;
    out.next = NULL;
 
    return ngx_http_output_filter(r, &out);
}