new file mode 100644
--- /dev/null
+++ b/src/http/ngx_http_parse.c
@@ -0,0 +1,475 @@
+
+#include <ngx_config.h>
+#include <ngx_http.h>
+
+int ngx_read_http_request_line(ngx_http_request_t *r)
+{
+    char  ch;
+    char *buff = r->buff->buff;
+    char *p = r->buff->pos;
+    enum {
+        rl_start = 0,
+        rl_space_after_method,
+        rl_spaces_before_uri,
+        rl_after_slash_in_uri,
+        rl_check_uri,
+        rl_uri,
+        rl_http_09,
+        rl_http_version,
+        rl_first_major_digit,
+        rl_major_digit,
+        rl_first_minor_digit,
+        rl_minor_digit,
+        rl_almost_done,
+        rl_done
+    } state = r->state;
+
+    while (p < r->buff->last && state < rl_done) {
+        ch = *p++;
+
+/*
+printf("\nstate: %d, pos: %x, end: %x, char: '%c' buf: %s",
+       state, p, r->buff->last, ch, p);
+*/
+
+        /* GCC complie it as jump table */
+
+        switch (state) {
+
+        /* HTTP methods: GET, HEAD, POST */
+        case rl_start:
+            switch (ch) {
+            case 'G':
+                if (p + 1 >= r->buff->last)
+                    return 0;
+
+                if (*p != 'E' || *(p + 1) != 'T')
+                    return NGX_HTTP_INVALID_METHOD;
+
+                r->method = NGX_HTTP_GET;
+                p += 2;
+                break;
+
+            case 'H':
+                if (p + 2 >= r->buff->last)
+                    return 0;
+
+                if (*p != 'E' || *(p + 1) != 'A' || *(p + 2) != 'D')
+                    return NGX_HTTP_INVALID_METHOD;
+
+                r->method = NGX_HTTP_HEAD;
+                p += 3;
+                break;
+
+            case 'P':
+                if (p + 2 >= r->buff->last)
+                    return 0;
+
+                if (*p != 'O' || *(p + 1) != 'S' || *(p + 2) != 'T')
+                    return NGX_HTTP_INVALID_METHOD;
+
+                r->method = NGX_HTTP_POST;
+                p += 3;
+                break;
+
+            default:
+                return NGX_HTTP_INVALID_METHOD;
+            }
+
+            state = rl_space_after_method;
+            break;
+
+        /* single space after method */
+        case rl_space_after_method:
+            switch (ch) {
+            case ' ':
+                state = rl_spaces_before_uri;
+                break;
+            default:
+                return NGX_HTTP_INVALID_METHOD;
+            }
+            break;
+
+        /* space* before URI */
+        case rl_spaces_before_uri:
+            switch (ch) {
+            case '/':
+                r->uri_start = p - 1;
+                state = rl_after_slash_in_uri;
+                break;
+            case ' ':
+                break;
+            default:
+                r->unusual_uri = 1;
+                r->uri_start = p - 1;
+                state = rl_uri;
+                break;
+            }
+            break;
+
+        /* check dot after slash */
+        case rl_after_slash_in_uri:
+            switch (ch) {
+            case CR:
+                r->uri_end = p - 1;
+                r->http_minor = 9;
+                state = rl_almost_done;
+                break;
+            case LF:
+                r->uri_end = p - 1;
+                r->http_minor = 9;
+                state = rl_done;
+                break;
+            case ' ':
+                r->uri_end = p - 1;
+                state = rl_http_09;
+                break;
+            case '.':
+                r->complex_uri = 1;
+                state = rl_uri;
+                break;
+            case '/':
+                r->complex_uri = 1;
+                state = rl_uri;
+                break;
+            case '?':
+                r->args_start = p;
+                state = rl_uri;
+                break;
+            default:
+                state = rl_check_uri;
+                break;
+            }
+            break;
+
+        /* check slash in URI */
+        case rl_check_uri:
+            switch (ch) {
+            case CR:
+                r->uri_end = p - 1;
+                r->http_minor = 9;
+                state = rl_almost_done;
+                break;
+            case LF:
+                r->uri_end = p - 1;
+                r->http_minor = 9;
+                state = rl_done;
+                break;
+            case ' ':
+                r->uri_end = p - 1;
+                state = rl_http_09;
+                break;
+            case '.':
+                r->uri_ext = p;
+                break;
+            case '/':
+                r->uri_ext = NULL;
+                state = rl_after_slash_in_uri;
+                break;
+            case '?':
+                r->args_start = p;
+                state = rl_uri;
+                break;
+            }
+            break;
+
+        /* URI */
+        case rl_uri:
+            switch (ch) {
+            case CR:
+                r->uri_end = p - 1;
+                r->http_minor = 9;
+                state = rl_almost_done;
+                break;
+            case LF:
+                r->uri_end = p - 1;
+                r->http_minor = 9;
+                state = rl_done;
+                break;
+            case ' ':
+                r->uri_end = p - 1;
+                state = rl_http_09;
+                break;
+            }
+            break;
+
+        /* space+ after URI */
+        case rl_http_09:
+            switch (ch) {
+            case ' ':
+                break;
+            case CR:
+                r->http_minor = 9;
+                state = rl_almost_done;
+                break;
+            case LF:
+                r->http_minor = 9;
+                state = rl_done;
+                break;
+            case 'H':
+                state = rl_http_version;
+                break;
+            default:
+                return NGX_HTTP_INVALID_REQUEST;
+            }
+            break;
+
+        /* TTP/ */
+        case rl_http_version:
+            if (p + 2 >= r->buff->last) {
+                r->state = rl_http_version;
+                r->buff->pos = p - 1;
+                return 0;
+            }
+
+            if (ch != 'T' || *p != 'T' || *(p + 1) != 'P' || *(p + 2) != '/')
+                return NGX_HTTP_INVALID_REQUEST;
+
+            p += 3;
+            state = rl_first_major_digit;
+            break;
+
+        /* first digit of major HTTP version */
+        case rl_first_major_digit:
+            if (ch < '1' || ch > '9')
+                return NGX_HTTP_INVALID_REQUEST;
+
+            r->http_major = ch - '0';
+            state = rl_major_digit;
+            break;
+
+        /* major HTTP version or dot */
+        case rl_major_digit:
+            if (ch == '.') {
+                state = rl_first_minor_digit;
+                break;
+            }
+
+            if (ch < '0' || ch > '9')
+                return NGX_HTTP_INVALID_REQUEST;
+
+            r->http_major = r->http_major * 10 + ch - '0';
+            break;
+
+        /* first digit of minor HTTP version */
+        case rl_first_minor_digit:
+            if (ch < '0' || ch > '9')
+                return NGX_HTTP_INVALID_REQUEST;
+
+            r->http_minor = ch - '0';
+
+            state = rl_minor_digit;
+            break;
+
+        /* minor HTTP version or end of request line */
+        case rl_minor_digit:
+            if (ch == CR) {
+                state = rl_almost_done;
+                break;
+            }
+
+            if (ch == LF) {
+                state = rl_done;
+                break;
+            }
+
+            if (ch < '0' || ch > '9')
+                return NGX_HTTP_INVALID_REQUEST;
+
+            r->http_minor = r->http_minor * 10 + ch - '0';
+            break;
+
+        /* end of request line */
+        case rl_almost_done:
+            switch (ch) {
+            case LF:
+                state = rl_done;
+                break;
+            default:
+                return NGX_HTTP_INVALID_METHOD;
+            }
+            break;
+        }
+    }
+
+    r->buff->pos = p;
+
+    if (state == rl_done) {
+        r->http_version = r->http_major * 1000 + r->http_minor;
+        r->state = rl_start;
+        return 1;
+    } else {
+        r->state = state;
+        return 0;
+    }
+}
+
+int ngx_read_http_header_line(ngx_http_request_t *r)
+{
+    char  c, ch;
+    char *buff = r->buff->buff;
+    char *p = r->buff->pos;
+    enum  {
+        hl_start = 0,
+        hl_name,
+        hl_space_before_value,
+        hl_value,
+        hl_space_after_value,
+        hl_almost_done,
+        header_almost_done,
+        hl_done,
+        header_done
+    } state = r->state;
+
+    while (p < r->buff->last && state < hl_done) {
+        ch = *p++;
+
+/*
+printf("\nstate: %d, pos: %x, end: %x, char: '%c' buf: %s",
+       state, p, r->buff->last, ch, p);
+*/
+
+        switch (state) {
+
+        /* first char */
+        case hl_start:
+            switch (ch) {
+            case CR:
+                r->header_end = p - 1;
+                state = header_almost_done;
+                break;
+            case LF:
+                r->header_end = p - 1;
+                state = header_done;
+                break;
+            default:
+                state = hl_name;
+                r->header_name_start = p - 1;
+
+                c = ch | 0x20;
+                if (c >= 'a' && c <= 'z')
+                    break;
+
+                if (ch == '-')
+                    break;
+
+                if (ch >= '0' && ch <= '9')
+                    break;
+
+                return NGX_HTTP_INVALID_HEADER;
+
+            }
+            break;
+
+        /* header name */
+        case hl_name:
+            c = ch | 0x20;
+            if (c >= 'a' && c <= 'z')
+                break;
+
+            if (ch == ':') {
+                r->header_name_end = p - 1;
+                state = hl_space_before_value;
+                break;
+            }
+
+            if (ch == '-')
+                break;
+
+            if (ch >= '0' && ch <= '9')
+                break;
+
+            return NGX_HTTP_INVALID_HEADER;
+
+        /* space* before header value */
+        case hl_space_before_value:
+            switch (ch) {
+            case ' ':
+                break;
+            case CR:
+                r->header_start = r->header_end = p - 1;
+                state = hl_almost_done;
+                break;
+            case LF:
+                r->header_start = r->header_end = p - 1;
+                state = hl_done;
+                break;
+            default:
+                r->header_start = p - 1;
+                state = hl_value;
+                break;
+            }
+            break;
+
+        /* header value */
+        case hl_value:
+            switch (ch) {
+            case ' ':
+                r->header_end = p - 1;
+                state = hl_space_after_value;
+                break;
+            case CR:
+                r->header_end = p - 1;
+                state = hl_almost_done;
+                break;
+            case LF:
+                r->header_end = p - 1;
+                state = hl_done;
+                break;
+            }
+            break;
+
+        /* space* before end of header line */
+        case hl_space_after_value:
+            switch (ch) {
+            case ' ':
+                break;
+            case CR:
+                state = hl_almost_done;
+                break;
+            case LF:
+                state = hl_done;
+                break;
+            default:
+                state = hl_value;
+                break;
+            }
+            break;
+
+        /* end of header line */
+        case hl_almost_done:
+            switch (ch) {
+            case LF:
+                state = hl_done;
+                break;
+            default:
+                return NGX_HTTP_INVALID_HEADER;
+            }
+            break;
+
+        /* end of header */
+        case header_almost_done:
+            switch (ch) {
+            case LF:
+                state = header_done;
+                break;
+            default:
+                return NGX_HTTP_INVALID_HEADER;
+            }
+            break;
+        }
+    }
+
+    r->buff->pos = p;
+
+    if (state == hl_done) {
+        r->state = hl_start;
+        return 1;
+    } else if (state == header_done) {
+        r->state = hl_start;
+        return 2;
+    } else {
+        r->state = state;
+        return 0;
+    }
+}