diff --git a/Cargo.toml b/Cargo.toml
index 2b9e87a..f316c34 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -101,6 +101,7 @@ perf = ["pyro", "dhat"]
 criterion = { version = "0.5.1", features = ["html_reports"] }
 pretty_assertions = "1.4.0"
 tokio-test = "0.4.4"
+tempfile = "3.10.1"
 
 [profile.release]
 codegen-units = 1
diff --git a/src/cache/file.rs b/src/cache/file.rs
index 2e21092..3085cae 100644
--- a/src/cache/file.rs
+++ b/src/cache/file.rs
@@ -17,11 +17,13 @@ use super::{Error, Result};
 use crate::util;
 use async_trait::async_trait;
 use std::path::Path;
+use tinyufo::TinyUfo;
 use tokio::fs;
 use tracing::info;
 
 pub struct FileCache {
     directory: String,
+    cache: TinyUfo<String, CacheObject>,
 }
 
 pub fn new_file_cache(dir: &str) -> Result<FileCache> {
@@ -32,12 +34,18 @@ pub fn new_file_cache(dir: &str) -> Result<FileCache> {
     }
     info!(dir, "new file cache");
 
-    Ok(FileCache { directory: dir })
+    Ok(FileCache {
+        directory: dir,
+        cache: TinyUfo::new(100, 100),
+    })
 }
 
 #[async_trait]
 impl HttpCacheStorage for FileCache {
     async fn get(&self, key: &str) -> Option<CacheObject> {
+        if let Some(obj) = self.cache.get(&key.to_string()) {
+            return Some(obj);
+        }
         let file = Path::new(&self.directory).join(key);
         let Ok(buf) = fs::read(file).await else {
             return None;
@@ -52,8 +60,9 @@ impl HttpCacheStorage for FileCache {
         &self,
         key: String,
         data: CacheObject,
-        _weight: u16,
+        weight: u16,
     ) -> Result<()> {
+        self.cache.put(key.clone(), data.clone(), weight);
         let buf: Vec<u8> = data.into();
         let file = Path::new(&self.directory).join(key);
         fs::write(file, buf)
@@ -62,6 +71,7 @@ impl HttpCacheStorage for FileCache {
         Ok(())
     }
     async fn remove(&self, key: &str) -> Result<Option<CacheObject>> {
+        // TODO remove from tinyufo
         let file = Path::new(&self.directory).join(key);
         fs::remove_file(file)
             .await
@@ -69,3 +79,38 @@ impl HttpCacheStorage for FileCache {
         Ok(None)
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::new_file_cache;
+    use crate::cache::http_cache::{CacheObject, HttpCacheStorage};
+    use pretty_assertions::assert_eq;
+    use std::sync::Arc;
+    use tempfile::TempDir;
+
+    #[tokio::test]
+    async fn test_file_cache() {
+        let dir = TempDir::new().unwrap();
+        let dir = dir.into_path().to_string_lossy().to_string();
+        let cache = new_file_cache(&dir).unwrap();
+        let key = "key".to_string();
+        let obj = CacheObject {
+            meta: (b"Hello".to_vec(), b"World".to_vec()),
+            body: Arc::new(b"Hello World!".to_vec()),
+        };
+        let result = cache.get(&key).await;
+        assert_eq!(true, result.is_none());
+        cache.put(key.clone(), obj.clone(), 1).await.unwrap();
+        let result = cache.get(&key).await.unwrap();
+        assert_eq!(obj, result);
+
+        // empty tinyufo, get from file
+        let cache = new_file_cache(&dir).unwrap();
+        let result = cache.get(&key).await.unwrap();
+        assert_eq!(obj, result);
+
+        cache.remove(&key).await.unwrap();
+        let result = cache.get(&key).await;
+        assert_eq!(true, result.is_none());
+    }
+}
diff --git a/src/cache/http_cache.rs b/src/cache/http_cache.rs
index d3c0b74..74745ef 100644
--- a/src/cache/http_cache.rs
+++ b/src/cache/http_cache.rs
@@ -29,7 +29,7 @@ use std::sync::Arc;
 
 type BinaryMeta = (Vec<u8>, Vec<u8>);
 
-#[derive(Debug, Clone, Default)]
+#[derive(Debug, Clone, Default, PartialEq)]
 pub struct CacheObject {
     pub meta: BinaryMeta,
     pub body: Arc<Vec<u8>>,
@@ -198,6 +198,7 @@ impl HandleMiss for ObjectMissHandler {
                 1,
             )
             .await?;
+
         Ok(size)
     }
 }
@@ -299,3 +300,57 @@ impl Storage for HttpCache {
         self
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::{CompleteHit, HttpCacheStorage, ObjectMissHandler};
+    use crate::cache::tiny::new_tiny_ufo_cache;
+    use bytes::{Bytes, BytesMut};
+    use pingora::cache::storage::{HitHandler, MissHandler};
+    use pretty_assertions::assert_eq;
+    use std::sync::Arc;
+
+    #[tokio::test]
+    async fn test_complete_hit() {
+        let body = Arc::new(b"Hello World!".to_vec());
+        let size = body.len();
+        let hit = CompleteHit {
+            body,
+            done: false,
+            range_start: 0,
+            range_end: size,
+        };
+        let mut handle: HitHandler = Box::new(hit);
+        let body = handle.read_body().await.unwrap();
+        assert_eq!(true, body.is_some());
+        assert_eq!(b"Hello World!", body.unwrap().as_ref());
+
+        handle.seek(1, Some(size - 1)).unwrap();
+        let body = handle.read_body().await.unwrap();
+        assert_eq!(true, body.is_some());
+        assert_eq!(b"ello World", body.unwrap().as_ref());
+    }
+
+    #[tokio::test]
+    async fn test_object_miss_handler() {
+        let key = "key";
+
+        let cache = Arc::new(new_tiny_ufo_cache(10, 10));
+        let obj = ObjectMissHandler {
+            meta: (b"Hello".to_vec(), b"World".to_vec()),
+            body: BytesMut::new(),
+            key: key.to_string(),
+            cache: cache.clone(),
+        };
+        let mut handle: MissHandler = Box::new(obj);
+
+        handle
+            .write_body(Bytes::from_static(b"Hello World!"), true)
+            .await
+            .unwrap();
+        handle.finish().await.unwrap();
+
+        let data = cache.get(key).await.unwrap();
+        assert_eq!("Hello World!", std::str::from_utf8(&data.body).unwrap());
+    }
+}
diff --git a/src/cache/tiny.rs b/src/cache/tiny.rs
index 7d0f110..89be4b6 100644
--- a/src/cache/tiny.rs
+++ b/src/cache/tiny.rs
@@ -51,3 +51,25 @@ impl HttpCacheStorage for TinyUfoCache {
         Ok(())
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::new_tiny_ufo_cache;
+    use crate::cache::http_cache::{CacheObject, HttpCacheStorage};
+    use pretty_assertions::assert_eq;
+    use std::sync::Arc;
+    #[tokio::test]
+    async fn test_tiny_ufo_cache() {
+        let cache = new_tiny_ufo_cache(10, 10);
+        let key = "key".to_string();
+        let obj = CacheObject {
+            meta: (b"Hello".to_vec(), b"World".to_vec()),
+            body: Arc::new(b"Hello World!".to_vec()),
+        };
+        let result = cache.get(&key).await;
+        assert_eq!(true, result.is_none());
+        cache.put(key.clone(), obj.clone(), 1).await.unwrap();
+        let result = cache.get(&key).await.unwrap();
+        assert_eq!(obj, result);
+    }
+}
diff --git a/src/http_extra/http_header.rs b/src/http_extra/http_header.rs
index 871c43c..87cdf5a 100644
--- a/src/http_extra/http_header.rs
+++ b/src/http_extra/http_header.rs
@@ -101,8 +101,7 @@ pub fn convert_header_value(
         _ => {
             if buf.starts_with(b"$") {
                 if let Ok(value) = std::env::var(
-                    std::string::String::from_utf8_lossy(&buf[1..buf.len()])
-                        .to_string(),
+                    std::str::from_utf8(&buf[1..buf.len()]).unwrap_or_default(),
                 ) {
                     return HeaderValue::from_str(&value).ok();
                 }
@@ -110,9 +109,7 @@ pub fn convert_header_value(
                 let mut value = BytesMut::with_capacity(20);
                 value = ctx.append_value(
                     value,
-                    std::string::String::from_utf8_lossy(&buf[1..buf.len()])
-                        .to_string()
-                        .as_str(),
+                    std::str::from_utf8(&buf[1..buf.len()]).unwrap_or_default(),
                 );
                 if !value.is_empty() {
                     return HeaderValue::from_bytes(&value).ok();
diff --git a/src/plugin/cache.rs b/src/plugin/cache.rs
index c1ba19b..3bbba53 100644
--- a/src/plugin/cache.rs
+++ b/src/plugin/cache.rs
@@ -140,7 +140,7 @@ impl TryFrom<&PluginConf> for Cache {
             predictor: value.contains_key("predictor"),
             lock: lock.as_secs().max(1) as u8,
             max_ttl,
-            max_file_size: max_file_size.as_u64().max(5 * 1024 * 1024) as usize,
+            max_file_size: max_file_size.as_u64().max(20 * 1024) as usize,
             namespace,
             headers,
         };
@@ -226,7 +226,7 @@ impl Plugin for Cache {
         }
         if !keys.is_empty() {
             let prefix =
-                std::string::String::from_utf8_lossy(&keys).to_string();
+                std::str::from_utf8(&keys).unwrap_or_default().to_string();
             debug!("Cache prefix: {prefix}");
             ctx.cache_prefix = Some(prefix);
         }
@@ -234,3 +234,77 @@ impl Plugin for Cache {
         Ok(None)
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::Cache;
+    use crate::config::{PluginConf, PluginStep};
+    use crate::plugin::Plugin;
+    use crate::state::State;
+    use pingora::proxy::Session;
+    use pretty_assertions::assert_eq;
+    use tokio_test::io::Builder;
+
+    #[test]
+    fn test_cache_params() {
+        let params = Cache::try_from(
+            &toml::from_str::<PluginConf>(
+                r###"
+eviction = true
+headers = ["Accept-Encoding"]
+lock = "2s"
+max_file_size = "100kb"
+predictor = true
+max_ttl = "1m"
+"###,
+            )
+            .unwrap(),
+        )
+        .unwrap();
+        assert_eq!(true, params.eviction);
+        assert_eq!(
+            r#"Some(["Accept-Encoding"])"#,
+            format!("{:?}", params.headers)
+        );
+        assert_eq!(2, params.lock);
+        assert_eq!(100 * 1000, params.max_file_size);
+        assert_eq!(60, params.max_ttl.unwrap().as_secs());
+        assert_eq!(true, params.predictor);
+    }
+    #[tokio::test]
+    async fn test_cache() {
+        let cache = Cache::try_from(
+            &toml::from_str::<PluginConf>(
+                r###"
+namespace = "pingap"
+eviction = true
+headers = ["Accept-Encoding"]
+lock = "2s"
+max_file_size = "100kb"
+predictor = true
+max_ttl = "1m"
+"###,
+            )
+            .unwrap(),
+        )
+        .unwrap();
+
+        assert_eq!("request", cache.step().to_string());
+        assert_eq!("cache", cache.category().to_string());
+
+        let headers = ["Accept-Encoding: gzip"].join("\r\n");
+        let input_header =
+            format!("GET /vicanso/pingap?size=1 HTTP/1.1\r\n{headers}\r\n\r\n");
+        let mock_io = Builder::new().read(input_header.as_bytes()).build();
+        let mut session = Session::new_h1(Box::new(mock_io));
+        session.read_request().await.unwrap();
+        let mut ctx = State::default();
+        cache
+            .handle_request(PluginStep::Request, &mut session, &mut ctx)
+            .await
+            .unwrap();
+        assert_eq!("pingap:gzip:", ctx.cache_prefix.unwrap());
+        assert_eq!(true, session.cache.enabled());
+        assert_eq!(100 * 1000, cache.max_file_size);
+    }
+}
diff --git a/src/proxy/server.rs b/src/proxy/server.rs
index a7b1707..1b40ee0 100644
--- a/src/proxy/server.rs
+++ b/src/proxy/server.rs
@@ -601,11 +601,13 @@ impl ProxyHttp for Server {
         session: &Session,
         ctx: &mut Self::CTX,
     ) -> pingora::Result<CacheKey> {
-        Ok(CacheKey::new(
+        let key = CacheKey::new(
             ctx.cache_prefix.clone().unwrap_or_default(),
             format!("{}", session.req_header().uri),
             "".to_string(),
-        ))
+        );
+        debug!(key = format!("{key:?}"), "cache key callback");
+        Ok(key)
     }
 
     fn response_cache_filter(
diff --git a/src/state/ctx.rs b/src/state/ctx.rs
index 12e4657..e481624 100644
--- a/src/state/ctx.rs
+++ b/src/state/ctx.rs
@@ -205,3 +205,126 @@ impl State {
         buf
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::State;
+    use crate::state::CompressionStat;
+    use crate::util;
+    use bytes::BytesMut;
+    use pretty_assertions::assert_eq;
+    use std::time::Duration;
+
+    #[test]
+    fn test_state() {
+        let mut ctx = State {
+            ..Default::default()
+        };
+
+        assert_eq!(
+            b"false",
+            ctx.append_value(BytesMut::new(), "reused").as_ref()
+        );
+
+        ctx.reused = true;
+        assert_eq!(
+            b"true",
+            ctx.append_value(BytesMut::new(), "reused").as_ref()
+        );
+
+        ctx.upstream_address = "192.168.1.1:80".to_string();
+        assert_eq!(
+            b"192.168.1.1:80",
+            ctx.append_value(BytesMut::new(), "upstream_addr").as_ref()
+        );
+
+        ctx.processing = 10;
+        assert_eq!(
+            b"10",
+            ctx.append_value(BytesMut::new(), "processing").as_ref()
+        );
+
+        ctx.upstream_connect_time = Some(1);
+        assert_eq!(
+            b"1ms",
+            ctx.append_value(BytesMut::new(), "upstream_connect_time")
+                .as_ref()
+        );
+
+        ctx.upstream_connected = Some(30);
+        assert_eq!(
+            b"30",
+            ctx.append_value(BytesMut::new(), "upstream_connected")
+                .as_ref()
+        );
+
+        ctx.upstream_processing_time = Some(2);
+        assert_eq!(
+            b"2ms",
+            ctx.append_value(BytesMut::new(), "upstream_processing_time")
+                .as_ref()
+        );
+
+        ctx.upstream_response_time = Some(3);
+        assert_eq!(
+            b"3ms",
+            ctx.append_value(BytesMut::new(), "upstream_response_time")
+                .as_ref()
+        );
+
+        ctx.location = "pingap".to_string();
+        assert_eq!(
+            b"pingap",
+            ctx.append_value(BytesMut::new(), "location").as_ref()
+        );
+
+        ctx.connection_time = 4;
+        assert_eq!(
+            b"4ms",
+            ctx.append_value(BytesMut::new(), "connection_time")
+                .as_ref()
+        );
+
+        ctx.tls_version = Some("tls1.3".to_string());
+        assert_eq!(
+            b"tls1.3",
+            ctx.append_value(BytesMut::new(), "tls_version").as_ref()
+        );
+
+        ctx.compression_stat = Some(CompressionStat {
+            in_bytes: 1024,
+            out_bytes: 500,
+            duration: Duration::from_millis(5),
+        });
+        assert_eq!(
+            b"5ms",
+            ctx.append_value(BytesMut::new(), "compression_time")
+                .as_ref()
+        );
+        assert_eq!(
+            b"2.0",
+            ctx.append_value(BytesMut::new(), "compression_ratio")
+                .as_ref()
+        );
+
+        ctx.cache_lookup_time = Some(6);
+        assert_eq!(
+            b"6ms",
+            ctx.append_value(BytesMut::new(), "cache_lookup_time")
+                .as_ref()
+        );
+
+        ctx.cache_lock_time = Some(7);
+        assert_eq!(
+            b"7ms",
+            ctx.append_value(BytesMut::new(), "cache_lock_time")
+                .as_ref()
+        );
+
+        ctx.created_at = util::now().as_millis() as u64 - 1;
+        assert_eq!(
+            b"1ms",
+            ctx.append_value(BytesMut::new(), "service_time").as_ref()
+        );
+    }
+}