static ngx_int_t
ngx_http_set_expires_type(ngx_http_request_t *r, ngx_http_headers_conf_t *conf)
{
ngx_http_headers_expires_time_t *et;
if (conf->enable_types) {
et = ngx_http_test_content_type(r, &conf->types);
if (et == NULL) {
et = ngx_http_test_content_type_wildcard(r, &conf->types);
}
if (et != NULL) {
if (et->expires == NGX_HTTP_EXPIRES_OFF) {
return NGX_OK;
}
return ngx_http_set_expires(r, et);
}
}
if (conf->default_expires.expires != NGX_HTTP_EXPIRES_OFF
&& conf->default_expires.expires != NGX_HTTP_EXPIRES_UNSET) {
return ngx_http_set_expires(r, &conf->default_expires);
}
return NGX_OK;
}
static ngx_int_t
ngx_http_headers_filter(ngx_http_request_t *r)
{
ngx_str_t value;
ngx_uint_t i;
ngx_http_header_val_t *h;
ngx_http_headers_conf_t *conf;
conf = ngx_http_get_module_loc_conf(r, ngx_http_headers_filter_module);
if ((conf->expires == NGX_HTTP_EXPIRES_OFF && conf->headers == NULL)
|| r != r->main
|| (r->headers_out.status != NGX_HTTP_OK
&& r->headers_out.status != NGX_HTTP_NO_CONTENT
&& r->headers_out.status != NGX_HTTP_MOVED_PERMANENTLY
&& r->headers_out.status != NGX_HTTP_MOVED_TEMPORARILY
&& r->headers_out.status != NGX_HTTP_NOT_MODIFIED))
{
return ngx_http_next_header_filter(r);
}
if (conf->expires != NGX_HTTP_EXPIRES_OFF) {
if (ngx_http_set_expires(r, conf) != NGX_OK) {
return NGX_ERROR;
}
}
if (conf->headers) {
h = conf->headers->elts;
for (i = 0; i < conf->headers->nelts; i++) {
if (h[i].lengths == NULL) {
value = h[i].value.value;
} else {
if (ngx_http_script_run(r, &value, h[i].lengths->elts, 0,
h[i].values->elts)
== NULL)
{
return NGX_ERROR;
}
}
if (h[i].handler(r, &h[i], &value) != NGX_OK) {
return NGX_ERROR;
}
}
}
return ngx_http_next_header_filter(r);
}
static ngx_int_t
ngx_http_headers_filter(ngx_http_request_t *r)
{
ngx_str_t value;
ngx_uint_t i;
ngx_http_header_val_t *h;
ngx_http_headers_conf_t *conf;
conf = ngx_http_get_module_loc_conf(r, ngx_http_headers_filter_module);
if ((conf->expires == NGX_HTTP_EXPIRES_OFF && conf->headers == NULL) // 未使用"expires"和"add_header"两个指定时， 将执行下一个filter
|| r != r->main // 当前请求不是根请求
|| (r->headers_out.status != NGX_HTTP_OK
&& r->headers_out.status != NGX_HTTP_NO_CONTENT
&& r->headers_out.status != NGX_HTTP_PARTIAL_CONTENT
&& r->headers_out.status != NGX_HTTP_MOVED_PERMANENTLY
&& r->headers_out.status != NGX_HTTP_MOVED_TEMPORARILY
&& r->headers_out.status != NGX_HTTP_SEE_OTHER
&& r->headers_out.status != NGX_HTTP_NOT_MODIFIED
&& r->headers_out.status != NGX_HTTP_TEMPORARY_REDIRECT))
{
return ngx_http_next_header_filter(r);
}
// 处理"expires"指令
if (conf->expires != NGX_HTTP_EXPIRES_OFF) { // 当使用了expires指令时
if (ngx_http_set_expires(r, conf) != NGX_OK) { // 添加"Expires"和"Cache-Control"头到响应头中
return NGX_ERROR;
}
}
// 处理"add_header"指令
if (conf->headers) {
h = conf->headers->elts;
for (i = 0; i < conf->headers->nelts; i++) {
if (ngx_http_complex_value(r, &h[i].value, &value) != NGX_OK) {
return NGX_ERROR;
}
if (h[i].handler(r, &h[i], &value) != NGX_OK) {
return NGX_ERROR;
}
}
}
return ngx_http_next_header_filter(r);
}
static ngx_int_t
ngx_http_headers_filter(ngx_http_request_t *r)
{
ngx_str_t value;
ngx_uint_t i;
ngx_http_header_val_t *h;
ngx_http_headers_conf_t *conf;
conf = ngx_http_get_module_loc_conf(r, ngx_http_headers_filter_module);
if ((conf->expires == NGX_HTTP_EXPIRES_OFF && conf->headers == NULL)
|| r != r->main
|| (r->headers_out.status != NGX_HTTP_OK
&& r->headers_out.status != NGX_HTTP_CREATED
&& r->headers_out.status != NGX_HTTP_NO_CONTENT
&& r->headers_out.status != NGX_HTTP_PARTIAL_CONTENT
&& r->headers_out.status != NGX_HTTP_MOVED_PERMANENTLY
&& r->headers_out.status != NGX_HTTP_MOVED_TEMPORARILY
&& r->headers_out.status != NGX_HTTP_SEE_OTHER
&& r->headers_out.status != NGX_HTTP_NOT_MODIFIED
&& r->headers_out.status != NGX_HTTP_TEMPORARY_REDIRECT))
{
return ngx_http_next_header_filter(r);
}
if (conf->expires != NGX_HTTP_EXPIRES_OFF) {
if (ngx_http_set_expires(r, conf) != NGX_OK) {
return NGX_ERROR;
}
}
if (conf->headers) {
h = conf->headers->elts;
for (i = 0; i < conf->headers->nelts; i++) {
if (ngx_http_complex_value(r, &h[i].value, &value) != NGX_OK) {
return NGX_ERROR;
}
if (h[i].handler(r, &h[i], &value) != NGX_OK) {
return NGX_ERROR;
}
}
}
return ngx_http_next_header_filter(r);
}
static ngx_int_t
ngx_http_headers_filter(ngx_http_request_t *r)
{
ngx_str_t value;
ngx_uint_t i, safe_status;
ngx_http_header_val_t *h;
ngx_http_headers_conf_t *conf;
conf = ngx_http_get_module_loc_conf(r, ngx_http_headers_filter_module);
if ((conf->expires == NGX_HTTP_EXPIRES_OFF && conf->headers == NULL)
|| r != r->main) //expires off并且没有配置add_header，或者为子请求
{
return ngx_http_next_header_filter(r);
}
switch (r->headers_out.status) {
case NGX_HTTP_OK:
case NGX_HTTP_CREATED:
case NGX_HTTP_NO_CONTENT:
case NGX_HTTP_PARTIAL_CONTENT:
case NGX_HTTP_MOVED_PERMANENTLY:
case NGX_HTTP_MOVED_TEMPORARILY:
case NGX_HTTP_SEE_OTHER:
case NGX_HTTP_NOT_MODIFIED:
case NGX_HTTP_TEMPORARY_REDIRECT:
safe_status = 1;
break;
default:
safe_status = 0;
break;
}
if (conf->expires != NGX_HTTP_EXPIRES_OFF && safe_status) {
if (ngx_http_set_expires(r, conf) != NGX_OK) {
return NGX_ERROR;
}
}
if (conf->headers) {
h = conf->headers->elts;
for (i = 0; i < conf->headers->nelts; i++) {
if (!safe_status && !h[i].always) {
continue;
}
if (ngx_http_complex_value(r, &h[i].value, &value) != NGX_OK) {
return NGX_ERROR;
}
if (h[i].handler(r, &h[i], &value) != NGX_OK) {
return NGX_ERROR;
}
}
}
return ngx_http_next_header_filter(r);
}