new file mode 100644
--- /dev/null
+++ b/src/http/modules/proxy/ngx_http_proxy_parse.c
@@ -0,0 +1,213 @@
+
+/*
+ * Copyright (C) Igor Sysoev
+ */
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_http.h>
+#include <ngx_http_proxy_handler.h>
+
+
+int ngx_http_proxy_parse_status_line(ngx_http_proxy_ctx_t *p)
+{
+    u_char   ch;
+    u_char  *pos;
+    enum  {
+        sw_start = 0,
+        sw_H,
+        sw_HT,
+        sw_HTT,
+        sw_HTTP,
+        sw_first_major_digit,
+        sw_major_digit,
+        sw_first_minor_digit,
+        sw_minor_digit,
+        sw_status,
+        sw_space_after_status,
+        sw_status_text,
+        sw_almost_done,
+        sw_done
+    } state;
+
+    state = p->parse_state;
+    pos = p->header_in->pos;
+
+    while (pos < p->header_in->last && state < sw_done) {
+        ch = *pos++;
+
+        switch (state) {
+
+        /* "HTTP/" */
+        case sw_start:
+            switch (ch) {
+            case 'H':
+                state = sw_H;
+                break;
+            default:
+                return NGX_HTTP_PROXY_PARSE_NO_HEADER;
+            }
+            break;
+
+        case sw_H:
+            switch (ch) {
+            case 'T':
+                state = sw_HT;
+                break;
+            default:
+                return NGX_HTTP_PROXY_PARSE_NO_HEADER;
+            }
+            break;
+
+        case sw_HT:
+            switch (ch) {
+            case 'T':
+                state = sw_HTT;
+                break;
+            default:
+                return NGX_HTTP_PROXY_PARSE_NO_HEADER;
+            }
+            break;
+
+        case sw_HTT:
+            switch (ch) {
+            case 'P':
+                state = sw_HTTP;
+                break;
+            default:
+                return NGX_HTTP_PROXY_PARSE_NO_HEADER;
+            }
+            break;
+
+        case sw_HTTP:
+            switch (ch) {
+            case '/':
+                state = sw_first_major_digit;
+                break;
+            default:
+                return NGX_HTTP_PROXY_PARSE_NO_HEADER;
+            }
+            break;
+
+        /* the first digit of major HTTP version */
+        case sw_first_major_digit:
+            if (ch < '1' || ch > '9') {
+                return NGX_HTTP_PROXY_PARSE_NO_HEADER;
+            }
+
+            state = sw_major_digit;
+            break;
+
+        /* the major HTTP version or dot */
+        case sw_major_digit:
+            if (ch == '.') {
+                state = sw_first_minor_digit;
+                break;
+            }
+
+            if (ch < '0' || ch > '9') {
+                return NGX_HTTP_PROXY_PARSE_NO_HEADER;
+            }
+
+            break;
+
+        /* the first digit of minor HTTP version */
+        case sw_first_minor_digit:
+            if (ch < '0' || ch > '9') {
+                return NGX_HTTP_PROXY_PARSE_NO_HEADER;
+            }
+
+            state = sw_minor_digit;
+            break;
+
+        /* the minor HTTP version or the end of the request line */
+        case sw_minor_digit:
+            if (ch == ' ') {
+                state = sw_status;
+                break;
+            }
+
+            if (ch < '0' || ch > '9') {
+                return NGX_HTTP_PROXY_PARSE_NO_HEADER;
+            }
+
+            break;
+
+        /* HTTP status code */
+        case sw_status:
+            if (ch < '0' || ch > '9') {
+                return NGX_HTTP_PROXY_PARSE_NO_HEADER;
+            }
+
+            p->status = p->status * 10 + ch - '0';
+
+            if (++p->status_count == 3) {
+                state = sw_space_after_status;
+                p->status_start = pos - 3;
+            }
+
+            break;
+
+         /* space or end of line */
+         case sw_space_after_status:
+            switch (ch) {
+            case ' ':
+                state = sw_status_text;
+                break;
+            case CR:
+                state = sw_almost_done;
+                break;
+            case LF:
+                state = sw_done;
+                break;
+            default:
+                return NGX_HTTP_PROXY_PARSE_NO_HEADER;
+            }
+            break;
+
+        /* any text until end of line */
+        case sw_status_text:
+            switch (ch) {
+            case CR:
+                state = sw_almost_done;
+
+                break;
+            case LF:
+                state = sw_done;
+                break;
+            }
+            break;
+
+        /* end of request line */
+        case sw_almost_done:
+            p->status_end = pos - 2;
+            switch (ch) {
+            case LF:
+                state = sw_done;
+                break;
+            default:
+                return NGX_HTTP_PROXY_PARSE_NO_HEADER;
+            }
+            break;
+
+        /* suppress warning */
+        case sw_done:
+            break;
+        }
+    }
+
+    p->header_in->pos = pos;
+
+    if (state == sw_done) {
+        if (p->status_end == NULL) {
+            p->status_end = pos - 1;
+        }
+
+        p->parse_state = sw_start;
+        return NGX_OK;
+    }
+
+    p->parse_state = state;
+    return NGX_AGAIN;
+}