# HG changeset patch
# User Ruslan Ermilov <ru@nginx.com>
# Date 1554713108 -10800
# Node ID d5e576eb76773e132b01ee89c621cae47854f6a9
# Parent  ee4eccd811cd7146c4e0b00b6f4a01f6b3275595
Updated docs for the upcoming NGINX Plus release.

diff --git a/xml/en/docs/http/ngx_http_api_module.xml b/xml/en/docs/http/ngx_http_api_module.xml
--- a/xml/en/docs/http/ngx_http_api_module.xml
+++ b/xml/en/docs/http/ngx_http_api_module.xml
@@ -101,21 +101,21 @@ All API requests include
 a supported API <link id="api_version">version</link> in the URI.
 Examples of API requests with this configuration:
 <example>
-http://127.0.0.1/api/3/
-http://127.0.0.1/api/3/nginx
-http://127.0.0.1/api/3/connections
-http://127.0.0.1/api/3/http/requests
-http://127.0.0.1/api/3/http/server_zones/server_backend
-http://127.0.0.1/api/3/http/caches/cache_backend
-http://127.0.0.1/api/3/http/upstreams/backend
-http://127.0.0.1/api/3/http/upstreams/backend/servers/
-http://127.0.0.1/api/3/http/upstreams/backend/servers/1
-http://127.0.0.1/api/3/http/keyvals/one?key=arg1
-http://127.0.0.1/api/3/stream/
-http://127.0.0.1/api/3/stream/server_zones/server_backend
-http://127.0.0.1/api/3/stream/upstreams/
-http://127.0.0.1/api/3/stream/upstreams/backend
-http://127.0.0.1/api/3/stream/upstreams/backend/servers/1
+http://127.0.0.1/api/4/
+http://127.0.0.1/api/4/nginx
+http://127.0.0.1/api/4/connections
+http://127.0.0.1/api/4/http/requests
+http://127.0.0.1/api/4/http/server_zones/server_backend
+http://127.0.0.1/api/4/http/caches/cache_backend
+http://127.0.0.1/api/4/http/upstreams/backend
+http://127.0.0.1/api/4/http/upstreams/backend/servers/
+http://127.0.0.1/api/4/http/upstreams/backend/servers/1
+http://127.0.0.1/api/4/http/keyvals/one?key=arg1
+http://127.0.0.1/api/4/stream/
+http://127.0.0.1/api/4/stream/server_zones/server_backend
+http://127.0.0.1/api/4/stream/upstreams/
+http://127.0.0.1/api/4/stream/upstreams/backend
+http://127.0.0.1/api/4/stream/upstreams/backend/servers/1
 </example>
 </para>
 
@@ -146,14 +146,14 @@ By default, the API is read-only.
 All API requests should contain a supported API version in the URI.
 If the request URI equals the location prefix,
 the list of supported API versions is returned.
-The current API version is “<literal>3</literal>”.
+The current API version is “<literal>4</literal>”.
 </para>
 
 <para>
 The optional “<literal>fields</literal>” argument in the request line
 specifies which fields of the requested objects will be output:
 <example>
-http://127.0.0.1/api/3/nginx?fields=version,build
+http://127.0.0.1/api/4/nginx?fields=version,build
 </example>
 </para>
 
@@ -185,6 +185,14 @@ Several servers may share the same zone.
 <list type="bullet">
 
 <listitem>
+The <literal>path</literal> and <literal>method</literal> fields of
+<link id="def_nginx_error">nginx error object</link>
+were removed in <link id="api_version">version</link> 4.
+These fields continue to exist in earlier api versions,
+but show an empty value.
+</listitem>
+
+<listitem>
 The <link id="stream_zone_sync_">/stream/zone_sync/</link> data
 were added in <link id="api_version">version</link> 3.
 </listitem>
@@ -952,7 +960,7 @@ nested object or list (<literal>KeyvalFo
 </listitem>
 <listitem id="patchHttpKeyvalZoneKeyValue">
 <literal>PATCH</literal> - Modify a key-value or delete a key
-<para>Changes the value of the selected key in the key-value pair or deletes a key by setting the key value to <literal>null</literal>.</para>
+<para>Changes the value of the selected key in the key-value pair or deletes a key by setting the key value to <literal>null</literal>. If <link url="https://nginx.org/en/docs/stream/ngx_stream_zone_sync_module.html#zone_sync">synchronization</link> of keyval zones in a cluster is enabled, deletes a key only on a target cluster node.</para>
 <para>
 Request parameters:
 <list type="tag">
@@ -978,7 +986,7 @@ keyval key not found (<literal>KeyvalKey
 </listitem>
 <listitem id="deleteHttpKeyvalZoneData">
 <literal>DELETE</literal> - Empty the HTTP keyval zone
-<para>Deletes all key-value pairs from the HTTP keyval shared memory <link url="https://nginx.org/en/docs/http/ngx_http_keyval_module.html#keyval_zone">zone</link>.</para>
+<para>Deletes all key-value pairs from the HTTP keyval shared memory <link url="https://nginx.org/en/docs/http/ngx_http_keyval_module.html#keyval_zone">zone</link>. If <link url="https://nginx.org/en/docs/stream/ngx_stream_zone_sync_module.html#zone_sync">synchronization</link> of keyval zones in a cluster is enabled, empties the keyval zone only on a target cluster node.</para>
 <para>
 Possible responses:
 </para>
@@ -1031,7 +1039,6 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns a collection of "<link id="def_nginx_stream_server_zone">Stream Server Zone</link>" objects for all  stream server zones </listitem>
-<listitem>404 - <link url="https://nginx.org/en/docs/stream/ngx_stream_core_module.html#stream">stream</link> not configured (<literal>StreamNotConfigured</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 </list>
@@ -1066,8 +1073,7 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns <link id="def_nginx_stream_server_zone">Stream Server Zone</link></listitem>
-<listitem>404 - Server zone not found (<literal>ServerZoneNotFound</literal>),
-<link url="https://nginx.org/en/docs/stream/ngx_stream_core_module.html#stream">stream</link> not configured (<literal>StreamNotConfigured</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Server zone not found (<literal>ServerZoneNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 <listitem id="deleteStreamServerZoneStat">
@@ -1078,8 +1084,7 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>204 - Success</listitem>
-<listitem>404 - Server zone not found (<literal>ServerZoneNotFound</literal>),
-<link url="https://nginx.org/en/docs/stream/ngx_stream_core_module.html#stream">stream</link> not configured (<literal>StreamNotConfigured</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Server zone not found (<literal>ServerZoneNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>405 - Method disabled (<literal>MethodDisabled</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
@@ -1108,7 +1113,6 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns a collection of "<link id="def_nginx_stream_upstream">Stream Upstream</link>" objects for all  stream upstreams </listitem>
-<listitem>404 - <link url="https://nginx.org/en/docs/stream/ngx_stream_core_module.html#stream">stream</link> not configured (<literal>StreamNotConfigured</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 </list>
@@ -1144,8 +1148,7 @@ Possible responses:
 <list type="bullet">
 <listitem>200 - Success, returns <link id="def_nginx_stream_upstream">Stream Upstream</link></listitem>
 <listitem>400 - Upstream is static (<literal>UpstreamStatic</literal>), returns <link id="def_nginx_error">Error</link></listitem>
-<listitem>404 - Upstream not found (<literal>UpstreamNotFound</literal>),
-<link url="https://nginx.org/en/docs/stream/ngx_stream_core_module.html#stream">stream</link> not configured (<literal>StreamNotConfigured</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Upstream not found (<literal>UpstreamNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 <listitem id="deleteStreamUpstreamStat">
@@ -1157,8 +1160,7 @@ Possible responses:
 <list type="bullet">
 <listitem>204 - Success</listitem>
 <listitem>400 - Upstream is static (<literal>UpstreamStatic</literal>), returns <link id="def_nginx_error">Error</link></listitem>
-<listitem>404 - Upstream not found (<literal>UpstreamNotFound</literal>),
-<link url="https://nginx.org/en/docs/stream/ngx_stream_core_module.html#stream">stream</link> not configured (<literal>StreamNotConfigured</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Upstream not found (<literal>UpstreamNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>405 - Method disabled (<literal>MethodDisabled</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
@@ -1186,8 +1188,7 @@ Possible responses:
 <list type="bullet">
 <listitem>200 - Success, returns an array of <link id="def_nginx_stream_upstream_conf_server">Stream Upstream Servers</link></listitem>
 <listitem>400 - Upstream is static (<literal>UpstreamStatic</literal>), returns <link id="def_nginx_error">Error</link></listitem>
-<listitem>404 - Upstream not found (<literal>UpstreamNotFound</literal>),
-<link url="https://nginx.org/en/docs/stream/ngx_stream_core_module.html#stream">stream</link> not configured (<literal>StreamNotConfigured</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Upstream not found (<literal>UpstreamNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 <listitem id="postStreamUpstreamServer">
@@ -1225,8 +1226,7 @@ invalid “<literal>slow_start</literal>” (<literal>UpstreamBadSlowStart</literal>),
 no resolver defined to resolve (<literal>UpstreamConfNoResolver</literal>),
 upstream “<value>name</value>” has no backup (<literal>UpstreamNoBackup</literal>),
 upstream “<value>name</value>” memory exhausted (<literal>UpstreamOutOfMemory</literal>), returns <link id="def_nginx_error">Error</link></listitem>
-<listitem>404 - Upstream not found (<literal>UpstreamNotFound</literal>),
-<link url="https://nginx.org/en/docs/stream/ngx_stream_core_module.html#stream">stream</link> not configured (<literal>StreamNotConfigured</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Upstream not found (<literal>UpstreamNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>405 - Method disabled (<literal>MethodDisabled</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>415 - JSON error (<literal>JsonError</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
@@ -1261,8 +1261,7 @@ Possible responses:
 <listitem>400 - Upstream is static (<literal>UpstreamStatic</literal>),
 invalid server ID (<literal>UpstreamBadServerId</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>404 - Upstream not found (<literal>UpstreamNotFound</literal>),
-server with ID “<value>id</value>” does not exist (<literal>UpstreamServerNotFound</literal>),
-<link url="https://nginx.org/en/docs/stream/ngx_stream_core_module.html#stream">stream</link> not configured (<literal>StreamNotConfigured</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+server with ID “<value>id</value>” does not exist (<literal>UpstreamServerNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 <listitem id="patchStreamUpstreamServer">
@@ -1300,8 +1299,7 @@ server “<value>ID</value>” address is immutable (<literal>UpstreamServerImmutable</literal>),
 server “<value>ID</value>” weight is immutable (<literal>UpstreamServerWeightImmutable</literal>),
 upstream “<literal>name</literal>” memory exhausted (<literal>UpstreamOutOfMemory</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>404 - Upstream not found (<literal>UpstreamNotFound</literal>),
-server with ID “<value>id</value>” does not exist (<literal>UpstreamServerNotFound</literal>),
-<link url="https://nginx.org/en/docs/stream/ngx_stream_core_module.html#stream">stream</link> not configured (<literal>StreamNotConfigured</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+server with ID “<value>id</value>” does not exist (<literal>UpstreamServerNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>405 - Method disabled (<literal>MethodDisabled</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>415 - JSON error (<literal>JsonError</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
@@ -1318,8 +1316,7 @@ Possible responses:
 invalid server ID (<literal>UpstreamBadServerId</literal>),
 server “<value>id</value>” not removable (<literal>UpstreamServerImmutable</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>404 - Upstream not found (<literal>UpstreamNotFound</literal>),
-server with ID “<value>id</value>” does not exist (<literal>UpstreamServerNotFound</literal>),
-<link url="https://nginx.org/en/docs/stream/ngx_stream_core_module.html#stream">stream</link> not configured (<literal>StreamNotConfigured</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+server with ID “<value>id</value>” does not exist (<literal>UpstreamServerNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>405 - Method disabled (<literal>MethodDisabled</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
@@ -1348,7 +1345,6 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns a collection of "<link id="def_nginx_stream_keyval_zone">Stream Keyval Shared Memory Zone</link>" objects for all  stream keyvals </listitem>
-<listitem>404 - <link url="https://nginx.org/en/docs/stream/ngx_stream_core_module.html#stream">stream</link> not configured (<literal>StreamNotConfigured</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 </list>
@@ -1384,8 +1380,7 @@ Possible responses:
 <list type="bullet">
 <listitem>200 - Success, returns <link id="def_nginx_stream_keyval_zone">Stream Keyval Shared Memory Zone</link></listitem>
 <listitem>404 - Keyval not found (<literal>KeyvalNotFound</literal>),
-keyval key not found (<literal>KeyvalKeyNotFound</literal>),
-<link url="https://nginx.org/en/docs/stream/ngx_stream_core_module.html#stream">stream</link> not configured (<literal>StreamNotConfigured</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+keyval key not found (<literal>KeyvalKeyNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 <listitem id="postStreamKeyvalZoneData">
@@ -1408,8 +1403,7 @@ Possible responses:
 <listitem>400 - Key required (<literal>KeyvalFormatError</literal>),
 only one key can be added (<literal>KeyvalFormatError</literal>),
 nested object or list (<literal>KeyvalFormatError</literal>), returns <link id="def_nginx_error">Error</link></listitem>
-<listitem>404 - Keyval not found (<literal>KeyvalNotFound</literal>),
-<link url="https://nginx.org/en/docs/stream/ngx_stream_core_module.html#stream">stream</link> not configured (<literal>StreamNotConfigured</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Keyval not found (<literal>KeyvalNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>405 - Method disabled (<literal>MethodDisabled</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>409 - Key already exists (<literal>KeyvalKeyExists</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>415 - JSON error (<literal>JsonError</literal>), returns <link id="def_nginx_error">Error</link></listitem>
@@ -1417,7 +1411,7 @@ nested object or list (<literal>KeyvalFo
 </listitem>
 <listitem id="patchStreamKeyvalZoneKeyValue">
 <literal>PATCH</literal> - Modify a key-value or delete a key
-<para>Changes the value of the selected key in the key-value pair or deletes a key by setting the key value to <literal>null</literal>.</para>
+<para>Changes the value of the selected key in the key-value pair or deletes a key by setting the key value to <literal>null</literal>. If <link url="https://nginx.org/en/docs/stream/ngx_stream_zone_sync_module.html#zone_sync">synchronization</link> of keyval zones in a cluster is enabled, deletes a key only on a target cluster node.</para>
 <para>
 Request parameters:
 <list type="tag">
@@ -1436,22 +1430,20 @@ Possible responses:
 only one key can be updated (<literal>KeyvalFormatError</literal>),
 nested object or list (<literal>KeyvalFormatError</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>404 - Keyval not found (<literal>KeyvalNotFound</literal>),
-keyval key not found (<literal>KeyvalKeyNotFound</literal>),
-<link url="https://nginx.org/en/docs/stream/ngx_stream_core_module.html#stream">stream</link> not configured (<literal>StreamNotConfigured</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+keyval key not found (<literal>KeyvalKeyNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>405 - Method disabled (<literal>MethodDisabled</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>415 - JSON error (<literal>JsonError</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 <listitem id="deleteStreamKeyvalZoneData">
 <literal>DELETE</literal> - Empty the stream keyval zone
-<para>Deletes all key-value pairs from the stream keyval shared memory <link url="https://nginx.org/en/docs/stream/ngx_stream_keyval_module.html#keyval_zone">zone</link>.</para>
+<para>Deletes all key-value pairs from the stream keyval shared memory <link url="https://nginx.org/en/docs/stream/ngx_stream_keyval_module.html#keyval_zone">zone</link>. If <link url="https://nginx.org/en/docs/stream/ngx_stream_zone_sync_module.html#zone_sync">synchronization</link> of keyval zones in a cluster is enabled, empties the keyval zone only on a target cluster node.</para>
 <para>
 Possible responses:
 </para>
 <list type="bullet">
 <listitem>204 - Success</listitem>
-<listitem>404 - Keyval not found (<literal>KeyvalNotFound</literal>),
-<link url="https://nginx.org/en/docs/stream/ngx_stream_core_module.html#stream">stream</link> not configured (<literal>StreamNotConfigured</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Keyval not found (<literal>KeyvalNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>405 - Method disabled (<literal>MethodDisabled</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
@@ -1471,8 +1463,6 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns <link id="def_nginx_stream_zone_sync">Stream Zone Sync Node</link></listitem>
-<listitem>404 - Zone sync not configured (<literal>ZoneSyncNotConfigured</literal>),
-<link url="https://nginx.org/en/docs/stream/ngx_stream_core_module.html#stream">stream</link> not configured (<literal>StreamNotConfigured</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 </list>
@@ -3009,18 +2999,6 @@ The total number of records stored in th
 <para>Error:</para>
 nginx error object.<list type="tag">
 <tag-name>
-<literal>path</literal> (<literal>string</literal>)
-</tag-name>
-<tag-desc>
-API path.
-</tag-desc>
-<tag-name>
-<literal>method</literal> (<literal>string</literal>)
-</tag-name>
-<tag-desc>
-HTTP method.
-</tag-desc>
-<tag-name>
 <literal>error</literal></tag-name>
 <tag-desc>
 <list type="tag">
diff --git a/xml/en/docs/http/ngx_http_api_module_head.xml b/xml/en/docs/http/ngx_http_api_module_head.xml
--- a/xml/en/docs/http/ngx_http_api_module_head.xml
+++ b/xml/en/docs/http/ngx_http_api_module_head.xml
@@ -101,21 +101,21 @@ All API requests include
 a supported API <link id="api_version">version</link> in the URI.
 Examples of API requests with this configuration:
 <example>
-http://127.0.0.1/api/3/
-http://127.0.0.1/api/3/nginx
-http://127.0.0.1/api/3/connections
-http://127.0.0.1/api/3/http/requests
-http://127.0.0.1/api/3/http/server_zones/server_backend
-http://127.0.0.1/api/3/http/caches/cache_backend
-http://127.0.0.1/api/3/http/upstreams/backend
-http://127.0.0.1/api/3/http/upstreams/backend/servers/
-http://127.0.0.1/api/3/http/upstreams/backend/servers/1
-http://127.0.0.1/api/3/http/keyvals/one?key=arg1
-http://127.0.0.1/api/3/stream/
-http://127.0.0.1/api/3/stream/server_zones/server_backend
-http://127.0.0.1/api/3/stream/upstreams/
-http://127.0.0.1/api/3/stream/upstreams/backend
-http://127.0.0.1/api/3/stream/upstreams/backend/servers/1
+http://127.0.0.1/api/4/
+http://127.0.0.1/api/4/nginx
+http://127.0.0.1/api/4/connections
+http://127.0.0.1/api/4/http/requests
+http://127.0.0.1/api/4/http/server_zones/server_backend
+http://127.0.0.1/api/4/http/caches/cache_backend
+http://127.0.0.1/api/4/http/upstreams/backend
+http://127.0.0.1/api/4/http/upstreams/backend/servers/
+http://127.0.0.1/api/4/http/upstreams/backend/servers/1
+http://127.0.0.1/api/4/http/keyvals/one?key=arg1
+http://127.0.0.1/api/4/stream/
+http://127.0.0.1/api/4/stream/server_zones/server_backend
+http://127.0.0.1/api/4/stream/upstreams/
+http://127.0.0.1/api/4/stream/upstreams/backend
+http://127.0.0.1/api/4/stream/upstreams/backend/servers/1
 </example>
 </para>
 
@@ -146,14 +146,14 @@ By default, the API is read-only.
 All API requests should contain a supported API version in the URI.
 If the request URI equals the location prefix,
 the list of supported API versions is returned.
-The current API version is “<literal>3</literal>”.
+The current API version is “<literal>4</literal>”.
 </para>
 
 <para>
 The optional “<literal>fields</literal>” argument in the request line
 specifies which fields of the requested objects will be output:
 <example>
-http://127.0.0.1/api/3/nginx?fields=version,build
+http://127.0.0.1/api/4/nginx?fields=version,build
 </example>
 </para>
 
@@ -185,6 +185,14 @@ Several servers may share the same zone.
 <list type="bullet">
 
 <listitem>
+The <literal>path</literal> and <literal>method</literal> fields of
+<link id="def_nginx_error">nginx error object</link>
+were removed in <link id="api_version">version</link> 4.
+These fields continue to exist in earlier api versions,
+but show an empty value.
+</listitem>
+
+<listitem>
 The <link id="stream_zone_sync_">/stream/zone_sync/</link> data
 were added in <link id="api_version">version</link> 3.
 </listitem>
diff --git a/xml/en/docs/http/ngx_http_upstream_hc_module.xml b/xml/en/docs/http/ngx_http_upstream_hc_module.xml
--- a/xml/en/docs/http/ngx_http_upstream_hc_module.xml
+++ b/xml/en/docs/http/ngx_http_upstream_hc_module.xml
@@ -9,7 +9,7 @@
 <module name="Module ngx_http_upstream_hc_module"
         link="/en/docs/http/ngx_http_upstream_hc_module.html"
         lang="en"
-        rev="4">
+        rev="5">
 
 <section id="summary">
 
@@ -290,6 +290,17 @@ body does not match regular expression “<literal>Welcome to nginx!</literal>”
 </tag-desc>
 
 </list>
+
+<list type="tag">
+
+<tag-name id="match_require"><literal>require</literal>
+                             <value>$variable</value>
+                             <literal>...;</literal></tag-name>
+<tag-desc>
+all specified variables are not empty and not equal to “0” (1.15.9).
+</tag-desc>
+
+</list>
 </para>
 
 <para>
@@ -328,6 +339,18 @@ match server_ok {
 }
 </example>
 
+<example>
+# status is 200 or 204
+map $upstream_status $good_status {
+    200 1;
+    204 1;
+}
+
+match server_ok {
+    require $good_status;
+}
+</example>
+
 </para>
 
 </directive>
diff --git a/xml/en/docs/stream/ngx_stream_proxy_module.xml b/xml/en/docs/stream/ngx_stream_proxy_module.xml
--- a/xml/en/docs/stream/ngx_stream_proxy_module.xml
+++ b/xml/en/docs/stream/ngx_stream_proxy_module.xml
@@ -9,7 +9,7 @@
 <module name="Module ngx_stream_proxy_module"
         link="/en/docs/stream/ngx_stream_proxy_module.html"
         lang="en"
-        rev="22">
+        rev="23">
 
 <section id="summary">
 
@@ -296,6 +296,40 @@ session is still not finished, the respo
 </directive>
 
 
+<directive name="proxy_session_drop">
+<syntax><literal>on</literal> | <literal>off</literal></syntax>
+<default>off</default>
+<context>stream</context>
+<context>server</context>
+<appeared-in>1.15.8</appeared-in>
+
+<para>
+Enables terminating all sessions to a proxied server
+after it was removed from the group or marked as permanently unavailable.
+This can occur because of
+<link doc="ngx_stream_core_module.xml" id="resolver">re-resolve</link>
+or with the API
+<link doc="../http/ngx_http_api_module.xml" id="deleteStreamUpstreamServer"><literal>DELETE</literal></link>
+command.
+A server can be marked as permanently unavailable if it is considered
+<link doc="ngx_stream_upstream_hc_module.xml" id="health_check">unhealthy</link>
+or with the API
+<link doc="../http/ngx_http_api_module.xml" id="patchStreamUpstreamServer"><literal>PATCH</literal></link>
+command.
+Each session is terminated when the next
+read or write event is processed for the client or proxied server.
+</para>
+
+<para>
+<note>
+This directive is available as part of our
+<commercial_version>commercial subscription</commercial_version>.
+</note>
+</para>
+
+</directive>
+
+
 <directive name="proxy_socket_keepalive">
 <syntax><literal>on</literal> | <literal>off</literal></syntax>
 <default>off</default>
diff --git a/xml/ru/docs/http/ngx_http_upstream_hc_module.xml b/xml/ru/docs/http/ngx_http_upstream_hc_module.xml
--- a/xml/ru/docs/http/ngx_http_upstream_hc_module.xml
+++ b/xml/ru/docs/http/ngx_http_upstream_hc_module.xml
@@ -9,7 +9,7 @@
 <module name="Модуль ngx_http_upstream_hc_module"
         link="/ru/docs/http/ngx_http_upstream_hc_module.html"
         lang="ru"
-        rev="4">
+        rev="5">
 
 <section id="summary">
 
@@ -293,6 +293,17 @@ http {
 </tag-desc>
 
 </list>
+
+<list type="tag">
+
+<tag-name id="match_require"><literal>require</literal>
+                             <value>$переменная</value>
+                             <literal>...;</literal></tag-name>
+<tag-desc>
+все указанные переменные непустые и не равны “0” (1.15.9).
+</tag-desc>
+
+</list>
 </para>
 
 <para>
@@ -331,6 +342,18 @@ match server_ok {
 }
 </example>
 
+<example>
+# код ответа равен 200 или 204
+map $upstream_status $good_status {
+    200     1;
+    204     1;
+}
+
+match server_ok {
+    require $good_status;
+}
+</example>
+
 </para>
 
 </directive>
diff --git a/xml/ru/docs/stream/ngx_stream_proxy_module.xml b/xml/ru/docs/stream/ngx_stream_proxy_module.xml
--- a/xml/ru/docs/stream/ngx_stream_proxy_module.xml
+++ b/xml/ru/docs/stream/ngx_stream_proxy_module.xml
@@ -9,7 +9,7 @@
 <module name="Модуль ngx_stream_proxy_module"
         link="/ru/docs/stream/ngx_stream_proxy_module.html"
         lang="ru"
-        rev="22">
+        rev="23">
 
 <section id="summary">
 
@@ -297,6 +297,38 @@ Cессия завершится после отправки всех принятых датаграмм
 </directive>
 
 
+<directive name="proxy_session_drop">
+<syntax><literal>on</literal> | <literal>off</literal></syntax>
+<default>off</default>
+<context>stream</context>
+<context>server</context>
+<appeared-in>1.15.8</appeared-in>
+
+<para>
+Позволяет завершить все сессии к проксируемому серверу,
+если он был удалён из группы или помечен как постоянно недоступный.
+Это может произойти вследствие повторного
+<link doc="ngx_stream_core_module.xml" id="resolver">преобразования имён</link>
+в адреса, а также при помощи команды API
+<link doc="../http/ngx_http_api_module.xml" id="deleteStreamUpstreamServer"><literal>DELETE</literal></link>.
+Сервер может быть помечен как постоянно недоступный в случае неуспешной
+<link doc="ngx_stream_upstream_hc_module.xml" id="health_check">проверки работоспособности</link>,
+а также при помощи команды API
+<link doc="../http/ngx_http_api_module.xml" id="patchStreamUpstreamServer"><literal>PATCH</literal></link>.
+Сессия завершается при обработке очередного
+события чтения или записи на стороне клиента или проксируемого сервера.
+</para>
+
+<para>
+<note>
+Эта директива доступна как часть
+<commercial_version>коммерческой подписки</commercial_version>.
+</note>
+</para>
+
+</directive>
+
+
 <directive name="proxy_socket_keepalive">
 <syntax><literal>on</literal> | <literal>off</literal></syntax>
 <default>off</default>