http content阶段,结束请求

源码:

ngx_int_t
ngx_http_core_content_phase(ngx_http_request_t *r,
    ngx_http_phase_handler_t *ph)
{
    size_t     root;
    ngx_int_t  rc;
    ngx_str_t  path;

    if (r->content_handler) {
        r->write_event_handler = ngx_http_request_empty_handler;
        ngx_http_finalize_request(r, r->content_handler(r));
        return NGX_OK;
    }

    ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                   "content phase: %ui", r->phase_handler);

    rc = ph->handler(r);

    if (rc != NGX_DECLINED) {
        ngx_http_finalize_request(r, rc);
        return NGX_OK;
    }

    /* rc == NGX_DECLINED */

    ph++;

    if (ph->checker) {
        r->phase_handler++;
        return NGX_AGAIN;
    }

    /* no content handler was found */

    if (r->uri.data[r->uri.len - 1] == '/') {

        if (ngx_http_map_uri_to_path(r, &path, &root, 0) != NULL) {
            ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                          "directory index of \"%s\" is forbidden", path.data);
        }

        ngx_http_finalize_request(r, NGX_HTTP_FORBIDDEN);
        return NGX_OK;
    }

    ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "no handler found");

    ngx_http_finalize_request(r, NGX_HTTP_NOT_FOUND);
    return NGX_OK;
}

这里注意核心几行代码:

if (r->content_handler) 
{//如果你注册了回调函数,就会执行整个流程,然后final这个request.
        r->write_event_handler = ngx_http_request_empty_handler;
        ngx_http_finalize_request(r, r->content_handler(r));
        return NGX_OK;
    }