diff --git a/src/http/ngx_http_header_filter_module.c b/src/http/ngx_http_header_filter_module.c
index 78682c5a1..fedb33c3b 100644
--- a/src/http/ngx_http_header_filter_module.c
+++ b/src/http/ngx_http_header_filter_module.c
@@ -87,7 +87,7 @@ static ngx_str_t ngx_http_status_lines[] = {
ngx_string("409 Conflict"),
ngx_string("410 Gone"),
ngx_string("411 Length Required"),
- ngx_null_string, /* "412 Precondition Failed" */
+ ngx_string("412 Precondition Failed"),
ngx_string("413 Request Entity Too Large"),
ngx_null_string, /* "414 Request-URI Too Large", but we never send it
* because we treat such requests as the HTTP/0.9
diff --git a/src/http/ngx_http_request.h b/src/http/ngx_http_request.h
index 5cdcb9498..22e17ee37 100644
--- a/src/http/ngx_http_request.h
+++ b/src/http/ngx_http_request.h
@@ -77,6 +77,7 @@
#define NGX_HTTP_REQUEST_TIME_OUT 408
#define NGX_HTTP_CONFLICT 409
#define NGX_HTTP_LENGTH_REQUIRED 411
+#define NGX_HTTP_PRECONDITION_FAILED 412
#define NGX_HTTP_REQUEST_ENTITY_TOO_LARGE 413
#define NGX_HTTP_REQUEST_URI_TOO_LARGE 414
#define NGX_HTTP_UNSUPPORTED_MEDIA_TYPE 415
diff --git a/src/http/ngx_http_special_response.c b/src/http/ngx_http_special_response.c
index c8190ed18..bb72079a9 100644
--- a/src/http/ngx_http_special_response.c
+++ b/src/http/ngx_http_special_response.c
@@ -139,6 +139,14 @@ static char error_411_page[] =
;
+static char error_412_page[] =
+"" CRLF
+"412 Precondition Failed" CRLF
+"" CRLF
+"412 Precondition Failed
" CRLF
+;
+
+
static char error_413_page[] =
"" CRLF
"413 Request Entity Too Large" CRLF
@@ -274,7 +282,7 @@ static ngx_str_t error_pages[] = {
ngx_string(error_409_page),
ngx_string(error_410_page),
ngx_string(error_411_page),
- ngx_null_string, /* 412 */
+ ngx_string(error_412_page),
ngx_string(error_413_page),
ngx_string(error_414_page),
ngx_string(error_415_page),