深入理解ningx， hello world模块代码

config文件：

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"

nginx_http_mytest_module.c:

#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>

static char *ngx_http_mytest(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
static ngx_int_t ngx_http_mytest_handler(ngx_http_request_t *request);

/*
static char *ngx_http_mytest_create_log_conf(ngx_conf_t *cf);

static char *ngx_http_mytest_create_loc_conf(ngx_conf_t *cf);

static char *ngx_http_mytest_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child);

*/
static ngx_command_t ngx_http_mytest_commands[] = {
{ ngx_string("mytest"),
NGX_HTTP_LOC_CONF|NGX_CONF_NOARGS,
ngx_http_mytest,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL
},
ngx_null_command
};

static ngx_http_module_t ngx_http_mytest_module_ctx = {
NULL,
NULL,

NULL,
NULL,

NULL,
NULL,

NULL,
NULL
};

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
};

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;
}

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;

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);
}