diff --git a/.hgtags b/.hgtags
index 2dcc1b3..d8c1590 100644
--- a/.hgtags
+++ b/.hgtags
@@ -445,3 +445,4 @@
 ce2ced3856909f36f8130c99eaa4dbdbae636ddc release-1.17.4
 9af0dddbddb2c368bfedd2801bc100ffad01e19b release-1.17.5
 de68d0d94320cbf033599c6f3ca37e5335c67fd7 release-1.17.6
+e56295fe0ea76bf53b06bffa77a2d3a9a335cb8c release-1.17.7
diff --git a/BUILD b/BUILD
index 49cae0a..148533f 100644
--- a/BUILD
+++ b/BUILD
@@ -1520,5 +1520,5 @@
     preinst = "@nginx_pkgoss//:debian_preinst",
     prerm = "@nginx_pkgoss//:debian_prerm",
     section = "httpd",
-    version = "1.17.6",
+    version = "1.17.7",
 )
diff --git a/build.bzl b/build.bzl
index bf99670..6b8620d 100644
--- a/build.bzl
+++ b/build.bzl
@@ -673,9 +673,9 @@
         name = "nginx_pkgoss",
         build_file_content = _PKGOSS_BUILD_FILE.format(nginx = nginx) +
                              _PKGOSS_BUILD_FILE_TAIL,
-        commit = "1810c740c9f6b1a812969f53d517e6276afe2caf",  # nginx-1.17.6
+        commit = "0c293ff483aea9e41a13192ea550374dc73a5027",  # nginx-1.17.7
         remote = "https://nginx.googlesource.com/nginx-pkgoss",
-        shallow_since = "1574167886 +0300",
+        shallow_since = "1577200078 +0300",
     )
 
 def nginx_repositories_zlib(bind):
diff --git a/docs/man/nginx.8 b/docs/man/nginx.8
index 1f4dc89..573d935 100644
--- a/docs/man/nginx.8
+++ b/docs/man/nginx.8
@@ -1,5 +1,5 @@
 .\"
-.\" Copyright (C) 2010 Sergey A. Osokin
+.\" Copyright (C) 2010, 2019 Sergey A. Osokin
 .\" Copyright (C) Nginx, Inc.
 .\" All rights reserved.
 .\"
@@ -25,7 +25,7 @@
 .\" SUCH DAMAGE.
 .\"
 .\"
-.Dd June 16, 2015
+.Dd December 5, 2019
 .Dt NGINX 8
 .Os
 .Sh NAME
@@ -42,7 +42,8 @@
 .Nm
 (pronounced
 .Dq engine x )
-is an HTTP and reverse proxy server, as well as a mail proxy server.
+is an HTTP and reverse proxy server, a mail proxy server, and a generic
+TCP/UDP proxy server.
 It is known for its high performance, stability, rich feature set, simple
 configuration, and low resource consumption.
 .Pp
@@ -82,15 +83,15 @@
 .It Cm reload
 .Dv SIGHUP
 .El
+.It Fl T
+Same as
+.Fl t ,
+but additionally dump configuration files to standard output.
 .It Fl t
 Do not run, just test the configuration file.
 .Nm
 checks the configuration file syntax and then tries to open files
 referenced in the configuration file.
-.It Fl T
-Same as
-.Fl t ,
-but additionally dump configuration files to standard output.
 .It Fl V
 Print the
 .Nm
diff --git a/docs/xml/nginx/changes.xml b/docs/xml/nginx/changes.xml
index e0cb545..359c25e 100644
--- a/docs/xml/nginx/changes.xml
+++ b/docs/xml/nginx/changes.xml
@@ -5,6 +5,90 @@
 <change_log title="nginx">
 
 
+<changes ver="1.17.7" date="2019-12-24">
+
+<change type="bugfix">
+<para lang="ru">
+на старте или во время переконфигурации мог произойти segmentation fault,
+если в конфигурации использовалась
+директива rewrite с пустой строкой замены.
+</para>
+<para lang="en">
+a segmentation fault might occur on start or during reconfiguration
+if the "rewrite" directive with an empty replacement string
+was used in the configuration.
+</para>
+</change>
+
+<change type="bugfix">
+<para lang="ru">
+в рабочем процессе мог произойти segmentation fault,
+если директива break использовалась совместно с директивой alias
+или директивой proxy_pass с URI.
+</para>
+<para lang="en">
+a segmentation fault might occur in a worker process 
+if the "break" directive was used with the "alias" directive
+or with the "proxy_pass" directive with a URI.
+</para>
+</change>
+
+<change type="bugfix">
+<para lang="ru">
+строка Location заголовка ответа могла содержать мусор,
+если URI запроса был изменён на URI, содержащий нулевой символ.
+</para>
+<para lang="en">
+the "Location" response header line might contain garbage
+if the request URI was rewritten to the one containing a null character.
+</para>
+</change>
+
+<change type="bugfix">
+<para lang="ru">
+при возврате перенаправлений с помощью директивы error_page
+запросы с телом обрабатывались некорректно;
+ошибка появилась в 0.7.12.
+</para>
+<para lang="en">
+requests with bodies were handled incorrectly
+when returning redirections with the "error_page" directive;
+the bug had appeared in 0.7.12.
+</para>
+</change>
+
+<change type="bugfix">
+<para lang="ru">
+утечки сокетов при использовании HTTP/2.
+</para>
+<para lang="en">
+socket leak when using HTTP/2.
+</para>
+</change>
+
+<change type="bugfix">
+<para lang="ru">
+при обработке pipelined-запросов по SSL-соединению мог произойти таймаут;
+ошибка появилась в 1.17.5.
+</para>
+<para lang="en">
+a timeout might occur while handling pipelined requests in an SSL connection;
+the bug had appeared in 1.17.5.
+</para>
+</change>
+
+<change type="bugfix">
+<para lang="ru">
+в модуле ngx_http_dav_module.
+</para>
+<para lang="en">
+in the ngx_http_dav_module.
+</para>
+</change>
+
+</changes>
+
+
 <changes ver="1.17.6" date="2019-11-19">
 
 <change type="feature">
diff --git a/src/core/nginx.h b/src/core/nginx.h
index ae88860..204fc34 100644
--- a/src/core/nginx.h
+++ b/src/core/nginx.h
@@ -13,8 +13,8 @@
 #define NGINX_NAME         "nginx"
 #endif
 
-#define nginx_version      1017006
-#define NGINX_VERSION      "1.17.6"
+#define nginx_version      1017007
+#define NGINX_VERSION      "1.17.7"
 #define NGINX_VER          NGINX_NAME "/" NGINX_VERSION
 
 #ifdef NGX_BUILD
diff --git a/src/event/ngx_event.c b/src/event/ngx_event.c
index f173945..4115cf9 100644
--- a/src/event/ngx_event.c
+++ b/src/event/ngx_event.c
@@ -238,8 +238,6 @@
     }
 
     if (!ngx_queue_empty(&ngx_posted_next_events)) {
-        ngx_queue_add(&ngx_posted_events, &ngx_posted_next_events);
-        ngx_queue_init(&ngx_posted_next_events);
         timer = 0;
     }
 
@@ -263,6 +261,7 @@
     }
 
     ngx_event_process_posted(cycle, &ngx_posted_events);
+    ngx_event_process_posted_next(cycle, &ngx_posted_next_events);
 }
 
 
diff --git a/src/event/ngx_event_openssl.c b/src/event/ngx_event_openssl.c
index 7d16b1f..35225f0 100644
--- a/src/event/ngx_event_openssl.c
+++ b/src/event/ngx_event_openssl.c
@@ -43,7 +43,6 @@
 #endif
 static ngx_int_t ngx_ssl_handle_recv(ngx_connection_t *c, int n);
 static void ngx_ssl_write_handler(ngx_event_t *wev);
-static void ngx_ssl_next_read_handler(ngx_event_t *rev);
 #ifdef SSL_READ_EARLY_DATA_SUCCESS
 static ssize_t ngx_ssl_write_early(ngx_connection_t *c, u_char *data,
     size_t size);
@@ -2041,11 +2040,6 @@
                         c->read->available = 0;
                         c->read->ready = 0;
 
-                        if (c->ssl->next_read_handler == NULL) {
-                            c->ssl->next_read_handler = c->read->handler;
-                            c->read->handler = ngx_ssl_next_read_handler;
-                        }
-
                         ngx_post_event(c->read, &ngx_posted_next_events);
                     }
 
@@ -2351,31 +2345,6 @@
 }
 
 
-static void
-ngx_ssl_next_read_handler(ngx_event_t *rev)
-{
-    ngx_connection_t  *c;
-
-    c = rev->data;
-
-    ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0, "SSL next read handler");
-
-    rev->handler = c->ssl->next_read_handler;
-    c->ssl->next_read_handler = NULL;
-
-    if (!rev->ready) {
-        rev->ready = 1;
-        rev->available = -1;
-    }
-
-    if (rev->posted) {
-        ngx_delete_posted_event(rev);
-    }
-
-    rev->handler(rev);
-}
-
-
 /*
  * OpenSSL has no SSL_writev() so we copy several bufs into our 16K buffer
  * before the SSL_write() call to decrease a SSL overhead.
diff --git a/src/event/ngx_event_openssl.h b/src/event/ngx_event_openssl.h
index 7aa471b..f34ccf9 100644
--- a/src/event/ngx_event_openssl.h
+++ b/src/event/ngx_event_openssl.h
@@ -86,7 +86,6 @@
 
     ngx_event_handler_pt        saved_read_handler;
     ngx_event_handler_pt        saved_write_handler;
-    ngx_event_handler_pt        next_read_handler;
 
     u_char                      early_buf;
 
diff --git a/src/event/ngx_event_posted.c b/src/event/ngx_event_posted.c
index fd0b411..125bf4c 100644
--- a/src/event/ngx_event_posted.c
+++ b/src/event/ngx_event_posted.c
@@ -34,3 +34,29 @@
         ev->handler(ev);
     }
 }
+
+
+void
+ngx_event_process_posted_next(ngx_cycle_t *cycle, ngx_queue_t *posted)
+{
+    ngx_queue_t  *q;
+    ngx_event_t  *ev;
+
+    while (!ngx_queue_empty(posted)) {
+
+        q = ngx_queue_head(posted);
+        ev = ngx_queue_data(q, ngx_event_t, queue);
+
+        ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
+                      "posted next event %p", ev);
+
+        ngx_delete_posted_event(ev);
+
+        if (!ev->ready) {
+            ev->ready = 1;
+            ev->available = -1;
+        }
+
+        ev->handler(ev);
+    }
+}
diff --git a/src/event/ngx_event_posted.h b/src/event/ngx_event_posted.h
index bac5b35..de0a804 100644
--- a/src/event/ngx_event_posted.h
+++ b/src/event/ngx_event_posted.h
@@ -39,6 +39,7 @@
 
 
 void ngx_event_process_posted(ngx_cycle_t *cycle, ngx_queue_t *posted);
+void ngx_event_process_posted_next(ngx_cycle_t *cycle, ngx_queue_t *posted);
 
 
 extern ngx_queue_t  ngx_posted_accept_events;
diff --git a/src/http/modules/ngx_http_dav_module.c b/src/http/modules/ngx_http_dav_module.c
index 95c7b32..8b69e6f 100644
--- a/src/http/modules/ngx_http_dav_module.c
+++ b/src/http/modules/ngx_http_dav_module.c
@@ -56,7 +56,7 @@
 static ngx_int_t ngx_http_dav_depth(ngx_http_request_t *r, ngx_int_t dflt);
 static ngx_int_t ngx_http_dav_error(ngx_log_t *log, ngx_err_t err,
     ngx_int_t not_found, char *failed, u_char *path);
-static ngx_int_t ngx_http_dav_location(ngx_http_request_t *r, u_char *path);
+static ngx_int_t ngx_http_dav_location(ngx_http_request_t *r);
 static void *ngx_http_dav_create_loc_conf(ngx_conf_t *cf);
 static char *ngx_http_dav_merge_loc_conf(ngx_conf_t *cf,
     void *parent, void *child);
@@ -285,7 +285,7 @@
     }
 
     if (status == NGX_HTTP_CREATED) {
-        if (ngx_http_dav_location(r, path.data) != NGX_OK) {
+        if (ngx_http_dav_location(r) != NGX_OK) {
             ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
             return;
         }
@@ -312,7 +312,7 @@
     ngx_file_info_t           fi;
     ngx_http_dav_loc_conf_t  *dlcf;
 
-    if (r->headers_in.content_length_n > 0) {
+    if (r->headers_in.content_length_n > 0 || r->headers_in.chunked) {
         ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                       "DELETE with body is unsupported");
         return NGX_HTTP_UNSUPPORTED_MEDIA_TYPE;
@@ -495,7 +495,7 @@
     size_t     root;
     ngx_str_t  path;
 
-    if (r->headers_in.content_length_n > 0) {
+    if (r->headers_in.content_length_n > 0 || r->headers_in.chunked) {
         ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                       "MKCOL with body is unsupported");
         return NGX_HTTP_UNSUPPORTED_MEDIA_TYPE;
@@ -513,7 +513,6 @@
     }
 
     *(p - 1) = '\0';
-    r->uri.len--;
 
     ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                    "http mkcol path: \"%s\"", path.data);
@@ -521,7 +520,7 @@
     if (ngx_create_dir(path.data, ngx_dir_access(dlcf->access))
         != NGX_FILE_ERROR)
     {
-        if (ngx_http_dav_location(r, path.data) != NGX_OK) {
+        if (ngx_http_dav_location(r) != NGX_OK) {
             return NGX_HTTP_INTERNAL_SERVER_ERROR;
         }
 
@@ -550,7 +549,9 @@
     ngx_http_dav_copy_ctx_t   copy;
     ngx_http_dav_loc_conf_t  *dlcf;
 
-    if (r->headers_in.content_length_n > 0) {
+    if (r->headers_in.content_length_n > 0 || r->headers_in.chunked) {
+        ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
+                      "COPY and MOVE with body are unsupported");
         return NGX_HTTP_UNSUPPORTED_MEDIA_TYPE;
     }
 
@@ -1069,35 +1070,16 @@
 
 
 static ngx_int_t
-ngx_http_dav_location(ngx_http_request_t *r, u_char *path)
+ngx_http_dav_location(ngx_http_request_t *r)
 {
-    u_char                    *location;
-    ngx_http_core_loc_conf_t  *clcf;
-
     r->headers_out.location = ngx_list_push(&r->headers_out.headers);
     if (r->headers_out.location == NULL) {
         return NGX_ERROR;
     }
 
-    clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
-
-    if (!clcf->alias && clcf->root_lengths == NULL) {
-        location = path + clcf->root.len;
-
-    } else {
-        location = ngx_pnalloc(r->pool, r->uri.len);
-        if (location == NULL) {
-            ngx_http_clear_location(r);
-            return NGX_ERROR;
-        }
-
-        ngx_memcpy(location, r->uri.data, r->uri.len);
-    }
-
     r->headers_out.location->hash = 1;
     ngx_str_set(&r->headers_out.location->key, "Location");
-    r->headers_out.location->value.len = r->uri.len;
-    r->headers_out.location->value.data = location;
+    r->headers_out.location->value = r->uri;
 
     return NGX_OK;
 }
diff --git a/src/http/modules/ngx_http_index_module.c b/src/http/modules/ngx_http_index_module.c
index c144b31..2ee1dd5 100644
--- a/src/http/modules/ngx_http_index_module.c
+++ b/src/http/modules/ngx_http_index_module.c
@@ -163,7 +163,7 @@
 
             name = ngx_http_map_uri_to_path(r, &path, &root, reserve);
             if (name == NULL) {
-                return NGX_ERROR;
+                return NGX_HTTP_INTERNAL_SERVER_ERROR;
             }
 
             allocated = path.data + path.len - name;
diff --git a/src/http/modules/ngx_http_rewrite_module.c b/src/http/modules/ngx_http_rewrite_module.c
index 3b49c45..0e6d4df 100644
--- a/src/http/modules/ngx_http_rewrite_module.c
+++ b/src/http/modules/ngx_http_rewrite_module.c
@@ -318,6 +318,11 @@
 
     value = cf->args->elts;
 
+    if (value[2].len == 0) {
+        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "empty replacement");
+        return NGX_CONF_ERROR;
+    }
+
     ngx_memzero(&rc, sizeof(ngx_regex_compile_t));
 
     rc.pattern = value[1];
diff --git a/src/http/modules/ngx_http_static_module.c b/src/http/modules/ngx_http_static_module.c
index 0e16c05..282d6ee 100644
--- a/src/http/modules/ngx_http_static_module.c
+++ b/src/http/modules/ngx_http_static_module.c
@@ -157,8 +157,8 @@
 
         len = r->uri.len + 1;
 
-        if (!clcf->alias && clcf->root_lengths == NULL && r->args.len == 0) {
-            location = path.data + clcf->root.len;
+        if (!clcf->alias && r->args.len == 0) {
+            location = path.data + root;
 
             *last = '/';
 
diff --git a/src/http/modules/ngx_http_upstream_keepalive_module.c b/src/http/modules/ngx_http_upstream_keepalive_module.c
index bdc4ae5..1560807 100644
--- a/src/http/modules/ngx_http_upstream_keepalive_module.c
+++ b/src/http/modules/ngx_http_upstream_keepalive_module.c
@@ -275,6 +275,7 @@
 
     c->idle = 0;
     c->sent = 0;
+    c->data = NULL;
     c->log = pc->log;
     c->read->log = pc->log;
     c->write->log = pc->log;
diff --git a/src/http/ngx_http_core_module.c b/src/http/ngx_http_core_module.c
index 1afdb19..cb3e531 100644
--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c
@@ -1843,7 +1843,8 @@
         }
     }
 
-    last = ngx_cpystrn(last, r->uri.data + alias, r->uri.len - alias + 1);
+    last = ngx_copy(last, r->uri.data + alias, r->uri.len - alias);
+    *last = '\0';
 
     return last;
 }
diff --git a/src/http/ngx_http_script.c b/src/http/ngx_http_script.c
index f2f5a1c..13c57d6 100644
--- a/src/http/ngx_http_script.c
+++ b/src/http/ngx_http_script.c
@@ -1470,7 +1470,14 @@
 void
 ngx_http_script_break_code(ngx_http_script_engine_t *e)
 {
-    e->request->uri_changed = 0;
+    ngx_http_request_t  *r;
+
+    r = e->request;
+
+    if (r->uri_changed) {
+        r->valid_location = 0;
+        r->uri_changed = 0;
+    }
 
     e->ip = ngx_http_script_exit;
 }
diff --git a/src/http/ngx_http_special_response.c b/src/http/ngx_http_special_response.c
index 17511c2..b9e812f 100644
--- a/src/http/ngx_http_special_response.c
+++ b/src/http/ngx_http_special_response.c
@@ -623,6 +623,12 @@
         return ngx_http_named_location(r, &uri);
     }
 
+    r->expect_tested = 1;
+
+    if (ngx_http_discard_request_body(r) != NGX_OK) {
+        r->keepalive = 0;
+    }
+
     location = ngx_list_push(&r->headers_out.headers);
 
     if (location == NULL) {
diff --git a/src/http/v2/ngx_http_v2.c b/src/http/v2/ngx_http_v2.c
index 345d1fc..5ce93ce 100644
--- a/src/http/v2/ngx_http_v2.c
+++ b/src/http/v2/ngx_http_v2.c
@@ -179,6 +179,7 @@
 static ngx_int_t ngx_http_v2_terminate_stream(ngx_http_v2_connection_t *h2c,
     ngx_http_v2_stream_t *stream, ngx_uint_t status);
 static void ngx_http_v2_close_stream_handler(ngx_event_t *ev);
+static void ngx_http_v2_retry_close_stream_handler(ngx_event_t *ev);
 static void ngx_http_v2_handle_connection_handler(ngx_event_t *rev);
 static void ngx_http_v2_idle_handler(ngx_event_t *rev);
 static void ngx_http_v2_finalize_connection(ngx_http_v2_connection_t *h2c,
@@ -4337,8 +4338,9 @@
     fc = stream->request->connection;
 
     if (stream->queued) {
-        fc->write->handler = ngx_http_v2_close_stream_handler;
-        fc->read->handler = ngx_http_empty_handler;
+        fc->error = 1;
+        fc->write->handler = ngx_http_v2_retry_close_stream_handler;
+        fc->read->handler = ngx_http_v2_retry_close_stream_handler;
         return;
     }
 
@@ -4461,6 +4463,22 @@
 
 
 static void
+ngx_http_v2_retry_close_stream_handler(ngx_event_t *ev)
+{
+    ngx_connection_t    *fc;
+    ngx_http_request_t  *r;
+
+    fc = ev->data;
+    r = fc->data;
+
+    ngx_log_debug0(NGX_LOG_DEBUG_HTTP, fc->log, 0,
+                   "http2 retry close stream handler");
+
+    ngx_http_v2_close_stream(r->stream, 0);
+}
+
+
+static void
 ngx_http_v2_handle_connection_handler(ngx_event_t *rev)
 {
     ngx_connection_t          *c;