diff --git a/doc/admin-guide/plugins/lua.en.rst b/doc/admin-guide/plugins/lua.en.rst
index d065d3d1e33..c7982381cd3 100644
--- a/doc/admin-guide/plugins/lua.en.rst
+++ b/doc/admin-guide/plugins/lua.en.rst
@@ -1838,6 +1838,7 @@ Socket address family
 
     TS_LUA_AF_INET (2)
     TS_LUA_AF_INET6 (10)
+    TS_LUA_AF_UNIX (1)
 
 
 :ref:`TOP <admin-plugins-ts-lua>`
diff --git a/plugins/lua/ts_lua_client_request.cc b/plugins/lua/ts_lua_client_request.cc
index ac2671cf10c..0fc9e534ba8 100644
--- a/plugins/lua/ts_lua_client_request.cc
+++ b/plugins/lua/ts_lua_client_request.cc
@@ -790,7 +790,7 @@ ts_lua_client_request_client_addr_get_port(lua_State *L)
 {
   struct sockaddr const *client_ip;
   ts_lua_http_ctx       *http_ctx;
-  int                    port;
+  int                    port = 0;
 
   GET_HTTP_CONTEXT(http_ctx, L);
 
@@ -802,7 +802,7 @@ ts_lua_client_request_client_addr_get_port(lua_State *L)
   } else {
     if (client_ip->sa_family == AF_INET) {
       port = ((struct sockaddr_in *)client_ip)->sin_port;
-    } else {
+    } else if (client_ip->sa_family == AF_INET6) {
       port = ((struct sockaddr_in6 *)client_ip)->sin6_port;
     }
 
@@ -817,7 +817,7 @@ ts_lua_client_request_client_addr_get_incoming_port(lua_State *L)
 {
   struct sockaddr const *incoming_addr;
   ts_lua_http_ctx       *http_ctx;
-  int                    port;
+  int                    port = 0;
 
   GET_HTTP_CONTEXT(http_ctx, L);
 
@@ -829,7 +829,7 @@ ts_lua_client_request_client_addr_get_incoming_port(lua_State *L)
   } else {
     if (incoming_addr->sa_family == AF_INET) {
       port = ((struct sockaddr_in *)incoming_addr)->sin_port;
-    } else {
+    } else if (incoming_addr->sa_family == AF_INET6) {
       port = ((struct sockaddr_in6 *)incoming_addr)->sin6_port;
     }
 
@@ -866,6 +866,8 @@ ts_lua_client_request_client_addr_get_addr(lua_State *L)
       port = ntohs(((struct sockaddr_in6 *)client_ip)->sin6_port);
       inet_ntop(AF_INET6, (const void *)&((struct sockaddr_in6 *)client_ip)->sin6_addr, cip, sizeof(cip));
       family = AF_INET6;
+    } else if (client_ip->sa_family == AF_UNIX) {
+      family = AF_UNIX;
     }
 
     lua_pushstring(L, cip);
diff --git a/plugins/lua/ts_lua_http.cc b/plugins/lua/ts_lua_http.cc
index 4326224f782..c59464cba68 100644
--- a/plugins/lua/ts_lua_http.cc
+++ b/plugins/lua/ts_lua_http.cc
@@ -1085,6 +1085,8 @@ ts_lua_http_get_ssn_remote_addr(lua_State *L)
       port = ntohs(((struct sockaddr_in6 *)client_ip)->sin6_port);
       inet_ntop(AF_INET6, (const void *)&((struct sockaddr_in6 *)client_ip)->sin6_addr, cip, sizeof(cip));
       family = AF_INET6;
+    } else if (client_ip->sa_family == AF_UNIX) {
+      family = AF_UNIX;
     }
 
     lua_pushstring(L, cip);
diff --git a/plugins/lua/ts_lua_server_request.cc b/plugins/lua/ts_lua_server_request.cc
index 26c28974360..913b7fba478 100644
--- a/plugins/lua/ts_lua_server_request.cc
+++ b/plugins/lua/ts_lua_server_request.cc
@@ -149,6 +149,9 @@ ts_lua_inject_server_request_server_addr_api(lua_State *L)
 
   lua_pushinteger(L, AF_INET6);
   lua_setglobal(L, "TS_LUA_AF_INET6");
+
+  lua_pushinteger(L, AF_UNIX);
+  lua_setglobal(L, "TS_LUA_AF_UNIX");
 }
 
 static void
@@ -768,7 +771,11 @@ ts_lua_server_request_server_addr_get_ip(lua_State *L)
       inet_ntop(AF_INET6, (const void *)&((struct sockaddr_in6 *)server_ip)->sin6_addr, sip, sizeof(sip));
     }
 
-    lua_pushstring(L, sip);
+    if (sip[0] == '\0') {
+      lua_pushnil(L);
+    } else {
+      lua_pushstring(L, sip);
+    }
   }
 
   return 1;
@@ -779,7 +786,7 @@ ts_lua_server_request_server_addr_get_port(lua_State *L)
 {
   struct sockaddr const *server_ip;
   ts_lua_http_ctx       *http_ctx;
-  int                    port;
+  int                    port = 0;
 
   GET_HTTP_CONTEXT(http_ctx, L);
 
@@ -791,7 +798,7 @@ ts_lua_server_request_server_addr_get_port(lua_State *L)
   } else {
     if (server_ip->sa_family == AF_INET) {
       port = ((struct sockaddr_in *)server_ip)->sin_port;
-    } else {
+    } else if (server_ip->sa_family == AF_INET6) {
       port = ((struct sockaddr_in6 *)server_ip)->sin6_port;
     }
 
@@ -806,7 +813,7 @@ ts_lua_server_request_server_addr_get_outgoing_port(lua_State *L)
 {
   struct sockaddr const *outgoing_addr;
   ts_lua_http_ctx       *http_ctx;
-  int                    port;
+  int                    port = 0;
 
   GET_HTTP_CONTEXT(http_ctx, L);
 
@@ -818,7 +825,7 @@ ts_lua_server_request_server_addr_get_outgoing_port(lua_State *L)
   } else {
     if (outgoing_addr->sa_family == AF_INET) {
       port = ((struct sockaddr_in *)outgoing_addr)->sin_port;
-    } else {
+    } else if (outgoing_addr->sa_family == AF_INET6) {
       port = ((struct sockaddr_in6 *)outgoing_addr)->sin6_port;
     }
 
@@ -855,6 +862,8 @@ ts_lua_server_request_server_addr_get_addr(lua_State *L)
       port = ntohs(((struct sockaddr_in6 *)server_ip)->sin6_port);
       inet_ntop(AF_INET6, (const void *)&((struct sockaddr_in6 *)server_ip)->sin6_addr, sip, sizeof(sip));
       family = AF_INET6;
+    } else if (server_ip->sa_family == AF_UNIX) {
+      family = AF_UNIX;
     }
 
     lua_pushstring(L, sip);
@@ -892,6 +901,8 @@ ts_lua_server_request_server_addr_get_nexthop_addr(lua_State *L)
       port = ntohs(((struct sockaddr_in6 *)server_ip)->sin6_port);
       inet_ntop(AF_INET6, (const void *)&((struct sockaddr_in6 *)server_ip)->sin6_addr, sip, sizeof(sip));
       family = AF_INET6;
+    } else if (server_ip->sa_family == AF_UNIX) {
+      family = AF_UNIX;
     }
 
     lua_pushstring(L, sip);
@@ -963,12 +974,14 @@ ts_lua_server_request_server_addr_set_addr(lua_State *L)
       if (!inet_pton(family, sip, &addr.sin4.sin_addr)) {
         return luaL_error(L, "invalid ipv4 address");
       }
-    } else {
+    } else if (family == AF_INET6) {
       addr.sin6.sin6_family = AF_INET6;
       addr.sin6.sin6_port   = htons(port);
       if (!inet_pton(family, sip, &addr.sin6.sin6_addr)) {
         return luaL_error(L, "invalid ipv6 address");
       }
+    } else {
+      return luaL_error(L, "invalid address family");
     }
 
     TSHttpTxnServerAddrSet(http_ctx->txnp, &addr.sa);
@@ -1009,12 +1022,14 @@ ts_lua_server_request_server_addr_set_outgoing_addr(lua_State *L)
       if (!inet_pton(family, sip, &addr.sin4.sin_addr)) {
         return luaL_error(L, "invalid ipv4 address");
       }
-    } else {
+    } else if (family == AF_INET6) {
       addr.sin6.sin6_family = AF_INET6;
       addr.sin6.sin6_port   = htons(port);
       if (!inet_pton(family, sip, &addr.sin6.sin6_addr)) {
         return luaL_error(L, "invalid ipv6 address");
       }
+    } else {
+      return luaL_error(L, "invalid address family");
     }
 
     TSHttpTxnOutgoingAddrSet(http_ctx->txnp, &addr.sa);
diff --git a/plugins/lua/ts_lua_vconn.cc b/plugins/lua/ts_lua_vconn.cc
index 0c7dd4d34f2..62781be4303 100644
--- a/plugins/lua/ts_lua_vconn.cc
+++ b/plugins/lua/ts_lua_vconn.cc
@@ -56,9 +56,9 @@ static int
 ts_lua_vconn_get_remote_addr(lua_State *L)
 {
   ts_lua_vconn_ctx *vconn_ctx;
-  int               port;
-  int               family;
-  char              sip[128];
+  int               port     = 0;
+  int               family   = AF_UNSPEC;
+  char              sip[128] = "";
 
   GET_VCONN_CONTEXT(vconn_ctx, L);
 
@@ -73,10 +73,12 @@ ts_lua_vconn_get_remote_addr(lua_State *L)
       port = ntohs(((struct sockaddr_in *)addr)->sin_port);
       inet_ntop(AF_INET, (const void *)&((struct sockaddr_in *)addr)->sin_addr, sip, sizeof(sip));
       family = AF_INET;
-    } else {
+    } else if (addr->sa_family == AF_INET6) {
       port = ntohs(((struct sockaddr_in6 *)addr)->sin6_port);
       inet_ntop(AF_INET6, (const void *)&((struct sockaddr_in6 *)addr)->sin6_addr, sip, sizeof(sip));
       family = AF_INET6;
+    } else if (addr->sa_family == AF_UNIX) {
+      family = AF_UNIX;
     }
 
     lua_pushstring(L, sip);