diff --git a/examples/async.rs b/examples/async.rs
index 2d1522f..34a30ac 100644
--- a/examples/async.rs
+++ b/examples/async.rs
@@ -5,12 +5,12 @@ use std::sync::Arc;
 use std::time::Instant;
 
 use ngx::core;
+use ngx::core::prelude::*;
 use ngx::ffi::{
-    ngx_array_push, ngx_command_t, ngx_conf_t, ngx_cycle, ngx_event_t, ngx_http_core_module, ngx_http_core_run_phases,
-    ngx_http_handler_pt, ngx_http_module_t, ngx_http_phases_NGX_HTTP_ACCESS_PHASE, ngx_http_request_t, ngx_int_t,
-    ngx_module_t, ngx_posted_events, ngx_queue_s, ngx_str_t, ngx_uint_t, NGX_CONF_TAKE1, NGX_HTTP_LOC_CONF,
-    NGX_HTTP_LOC_CONF_OFFSET, NGX_HTTP_MODULE,
+    ngx_array_push, ngx_http_core_module, ngx_http_core_run_phases, ngx_http_phases_NGX_HTTP_ACCESS_PHASE,
+    ngx_posted_events, ngx_queue_s,
 };
+use ngx::http::prelude::*;
 use ngx::http::{self, HTTPModule, MergeConfigError};
 use ngx::{http_request_handler, ngx_log_debug_http, ngx_null_command, ngx_string};
 use tokio::runtime::Runtime;
diff --git a/examples/awssig.rs b/examples/awssig.rs
index bc99f02..b03630c 100644
--- a/examples/awssig.rs
+++ b/examples/awssig.rs
@@ -3,11 +3,9 @@ use std::ptr::addr_of;
 
 use http::HeaderMap;
 use ngx::core;
-use ngx::ffi::{
-    ngx_array_push, ngx_command_t, ngx_conf_t, ngx_http_core_module, ngx_http_handler_pt, ngx_http_module_t,
-    ngx_http_phases_NGX_HTTP_PRECONTENT_PHASE, ngx_int_t, ngx_module_t, ngx_str_t, ngx_uint_t, NGX_CONF_TAKE1,
-    NGX_HTTP_LOC_CONF, NGX_HTTP_LOC_CONF_OFFSET, NGX_HTTP_MODULE, NGX_HTTP_SRV_CONF,
-};
+use ngx::core::prelude::*;
+use ngx::ffi::{ngx_array_push, ngx_http_phases_NGX_HTTP_PRECONTENT_PHASE};
+use ngx::http::prelude::*;
 use ngx::http::*;
 use ngx::{http_request_handler, ngx_log_debug_http, ngx_null_command, ngx_string};
 
diff --git a/examples/curl.rs b/examples/curl.rs
index 1e4521b..7c01d35 100644
--- a/examples/curl.rs
+++ b/examples/curl.rs
@@ -2,11 +2,9 @@ use std::ffi::{c_char, c_void};
 use std::ptr::addr_of;
 
 use ngx::core;
-use ngx::ffi::{
-    ngx_array_push, ngx_command_t, ngx_conf_t, ngx_http_core_module, ngx_http_handler_pt, ngx_http_module_t,
-    ngx_http_phases_NGX_HTTP_ACCESS_PHASE, ngx_int_t, ngx_module_t, ngx_str_t, ngx_uint_t, NGX_CONF_TAKE1,
-    NGX_HTTP_LOC_CONF, NGX_HTTP_LOC_CONF_OFFSET, NGX_HTTP_MODULE,
-};
+use ngx::core::prelude::*;
+use ngx::ffi::{ngx_array_push, ngx_http_phases_NGX_HTTP_ACCESS_PHASE};
+use ngx::http::prelude::*;
 use ngx::http::{self, HTTPModule, MergeConfigError};
 use ngx::{http_request_handler, ngx_log_debug_http, ngx_null_command, ngx_string};
 
diff --git a/examples/httporigdst.rs b/examples/httporigdst.rs
index 87f7538..cf0b7c2 100644
--- a/examples/httporigdst.rs
+++ b/examples/httporigdst.rs
@@ -2,11 +2,12 @@ use std::ffi::{c_int, c_void};
 use std::ptr::addr_of;
 
 use ngx::core;
+use ngx::core::prelude::*;
 use ngx::ffi::{
-    in_port_t, ngx_conf_t, ngx_connection_local_sockaddr, ngx_http_add_variable, ngx_http_module_t,
-    ngx_http_variable_t, ngx_inet_get_port, ngx_int_t, ngx_module_t, ngx_sock_ntop, ngx_str_t, ngx_uint_t,
-    ngx_variable_value_t, sockaddr, sockaddr_storage, INET_ADDRSTRLEN, NGX_HTTP_MODULE,
+    in_port_t, ngx_conf_t, ngx_connection_local_sockaddr, ngx_inet_get_port, ngx_sock_ntop, sockaddr, sockaddr_storage,
+    INET_ADDRSTRLEN,
 };
+use ngx::http::prelude::*;
 use ngx::http::{self, HTTPModule};
 use ngx::{http_variable_get, ngx_http_null_variable, ngx_log_debug_http, ngx_null_string, ngx_string};
 
diff --git a/examples/upstream.rs b/examples/upstream.rs
index 1b701ac..25806f2 100644
--- a/examples/upstream.rs
+++ b/examples/upstream.rs
@@ -11,14 +11,14 @@ use std::mem;
 use std::ptr::addr_of;
 use std::slice;
 
+use ngx::core::prelude::*;
 use ngx::core::{Pool, Status};
 use ngx::ffi::{
-    ngx_atoi, ngx_command_t, ngx_conf_t, ngx_connection_t, ngx_event_free_peer_pt, ngx_event_get_peer_pt,
-    ngx_http_module_t, ngx_http_upstream_init_peer_pt, ngx_http_upstream_init_pt, ngx_http_upstream_init_round_robin,
-    ngx_http_upstream_module, ngx_http_upstream_srv_conf_t, ngx_http_upstream_t, ngx_int_t, ngx_module_t,
-    ngx_peer_connection_t, ngx_str_t, ngx_uint_t, NGX_CONF_NOARGS, NGX_CONF_TAKE1, NGX_CONF_UNSET, NGX_ERROR,
-    NGX_HTTP_MODULE, NGX_HTTP_SRV_CONF_OFFSET, NGX_HTTP_UPS_CONF, NGX_LOG_EMERG,
+    ngx_atoi, ngx_event_free_peer_pt, ngx_event_get_peer_pt, ngx_http_upstream_init_peer_pt, ngx_http_upstream_init_pt,
+    ngx_http_upstream_init_round_robin, ngx_http_upstream_module, ngx_http_upstream_srv_conf_t, ngx_http_upstream_t,
+    ngx_peer_connection_t, NGX_ERROR,
 };
+use ngx::http::prelude::*;
 use ngx::http::{
     ngx_http_conf_get_module_srv_conf, ngx_http_conf_upstream_srv_conf_immutable,
     ngx_http_conf_upstream_srv_conf_mutable, HTTPModule, Merge, MergeConfigError, Request,
diff --git a/src/core/mod.rs b/src/core/mod.rs
index 07ef434..4531caf 100644
--- a/src/core/mod.rs
+++ b/src/core/mod.rs
@@ -1,5 +1,9 @@
 mod buffer;
 mod pool;
+/// The prelude module.
+///
+/// This module provides common constants and types that are used in NGINX modules.
+pub mod prelude;
 mod status;
 mod string;
 
diff --git a/src/core/prelude.rs b/src/core/prelude.rs
new file mode 100644
index 0000000..38cc276
--- /dev/null
+++ b/src/core/prelude.rs
@@ -0,0 +1,40 @@
+pub use crate::ffi::ngx_command_t;
+pub use crate::ffi::ngx_conf_t;
+pub use crate::ffi::ngx_connection_t;
+pub use crate::ffi::ngx_event_t;
+pub use crate::ffi::ngx_int_t;
+pub use crate::ffi::ngx_module_t;
+pub use crate::ffi::ngx_str_t;
+pub use crate::ffi::ngx_uint_t;
+pub use crate::ffi::ngx_variable_value_t;
+
+pub use crate::ffi::NGX_LOG_ALERT;
+pub use crate::ffi::NGX_LOG_CRIT;
+pub use crate::ffi::NGX_LOG_DEBUG;
+pub use crate::ffi::NGX_LOG_EMERG;
+pub use crate::ffi::NGX_LOG_ERR;
+pub use crate::ffi::NGX_LOG_INFO;
+pub use crate::ffi::NGX_LOG_NOTICE;
+pub use crate::ffi::NGX_LOG_WARN;
+
+pub use crate::ffi::NGX_ANY_CONF;
+pub use crate::ffi::NGX_CONF_1MORE;
+pub use crate::ffi::NGX_CONF_2MORE;
+pub use crate::ffi::NGX_CONF_ANY;
+pub use crate::ffi::NGX_CONF_ARGS_NUMBER;
+pub use crate::ffi::NGX_CONF_BLOCK;
+pub use crate::ffi::NGX_CONF_FLAG;
+pub use crate::ffi::NGX_CONF_NOARGS;
+pub use crate::ffi::NGX_CONF_TAKE1;
+pub use crate::ffi::NGX_CONF_TAKE2;
+pub use crate::ffi::NGX_CONF_TAKE3;
+pub use crate::ffi::NGX_CONF_TAKE4;
+pub use crate::ffi::NGX_CONF_TAKE5;
+pub use crate::ffi::NGX_CONF_TAKE6;
+pub use crate::ffi::NGX_CONF_TAKE7;
+pub use crate::ffi::NGX_CONF_UNSET;
+pub use crate::ffi::NGX_DIRECT_CONF;
+pub use crate::ffi::NGX_MAIN_CONF;
+
+pub use crate::ffi::ngx_cycle;
+pub use crate::ffi::ngx_posted_events;
diff --git a/src/http/mod.rs b/src/http/mod.rs
index 00c329a..b273588 100644
--- a/src/http/mod.rs
+++ b/src/http/mod.rs
@@ -1,5 +1,9 @@
 mod conf;
 mod module;
+/// The prelude module.
+///
+/// This module provides common constants and types that are used in NGINX http modules.
+pub mod prelude;
 mod request;
 mod status;
 mod upstream;
diff --git a/src/http/prelude.rs b/src/http/prelude.rs
new file mode 100644
index 0000000..40d7f7f
--- /dev/null
+++ b/src/http/prelude.rs
@@ -0,0 +1,23 @@
+pub use crate::ffi::ngx_http_handler_pt;
+pub use crate::ffi::ngx_http_module_t;
+pub use crate::ffi::ngx_http_request_t;
+pub use crate::ffi::ngx_http_variable_t;
+pub use crate::ffi::ngx_http_variable_value_t;
+
+pub use crate::ffi::NGX_HTTP_MODULE;
+
+pub use crate::ffi::NGX_HTTP_LIF_CONF;
+pub use crate::ffi::NGX_HTTP_LMT_CONF;
+pub use crate::ffi::NGX_HTTP_LOC_CONF;
+pub use crate::ffi::NGX_HTTP_MAIN_CONF;
+pub use crate::ffi::NGX_HTTP_SIF_CONF;
+pub use crate::ffi::NGX_HTTP_SRV_CONF;
+pub use crate::ffi::NGX_HTTP_UPS_CONF;
+
+pub use crate::ffi::NGX_HTTP_LOC_CONF_OFFSET;
+pub use crate::ffi::NGX_HTTP_MAIN_CONF_OFFSET;
+pub use crate::ffi::NGX_HTTP_SRV_CONF_OFFSET;
+
+pub use crate::ffi::ngx_http_core_module;
+
+pub use crate::ffi::ngx_http_add_variable;