new file mode 100644
--- /dev/null
+++ b/src/event/ngx_event_proxy.h
@@ -0,0 +1,72 @@
+#ifndef _NGX_EVENT_PROXY_H_INCLUDED_
+#define _NGX_EVENT_PROXY_H_INCLUDED_
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_hunk.h>
+#include <ngx_file.h>
+#include <ngx_files.h>
+#include <ngx_connection.h>
+
+
+typedef struct ngx_event_proxy_s  ngx_event_proxy_t;
+
+typedef int (*ngx_event_proxy_input_filter_pt)(ngx_event_proxy_t *p);
+typedef int (*ngx_event_proxy_output_filter_pt)(void *data, ngx_hunk_t *hunk);
+
+
+struct ngx_event_proxy_s {
+    ngx_chain_t       *read_hunks;
+    ngx_chain_t       *last_read_hunk;
+    ngx_chain_t       *in_hunks;
+    ngx_chain_t       *last_in_hunk;
+    ngx_chain_t       *shadow_hunks;
+    ngx_chain_t       *out_hunks;
+    ngx_chain_t       *last_out_hunk;
+    ngx_chain_t       *free_hunks;
+    ngx_hunk_t        *busy_hunk;
+
+    ngx_event_proxy_input_filter_pt   input_filter;
+    void              *input_data;
+
+    ngx_event_proxy_output_filter_pt  output_filter;
+    void              *output_data;
+
+    unsigned           cachable:1;
+    unsigned           block_upstream:1;
+    unsigned           upstream_eof:1;
+    unsigned           upstream_error:1;
+    unsigned           client_eof:1;
+    unsigned           client_error:1;
+
+    int                level;
+
+    int                allocated;
+    int                block_size;
+    int                max_block_size;
+
+    off_t              temp_offset;
+    off_t              max_temp_size;
+    int                file_block_size;
+
+    ngx_connection_t  *upstream;
+    ngx_connection_t  *client;
+
+    ngx_pool_t        *pool;
+    ngx_log_t         *log;
+
+    ngx_file_t        *temp_file;
+    ngx_path_t        *temp_path;
+    int                number;
+    int                random;
+    char              *temp_file_warn;
+};
+
+
+int ngx_event_proxy_read_upstream(ngx_event_proxy_t *p);
+int ngx_event_proxy_write_to_client(ngx_event_proxy_t *p);
+int ngx_event_proxy_write_chain_to_temp_file(ngx_event_proxy_t *p);
+
+
+#endif /* _NGX_EVENT_PROXY_H_INCLUDED_ */