diff --git a/.github/workflows/docker.rust.yml b/.github/workflows/docker.rust.yml
index fea6d5e..0c94ef0 100644
--- a/.github/workflows/docker.rust.yml
+++ b/.github/workflows/docker.rust.yml
@@ -41,7 +41,7 @@ jobs:
         run: cargo fmt --check
 
   release-docker:
-    needs: tests
+    needs: release-binary
     runs-on: ubuntu-latest
     permissions:
       contents: read
@@ -134,6 +134,7 @@ jobs:
         with:
           toolchain: stable
           target: ${{ matrix.target }}
+          components: clippy
 
       - name: Sccache cache
         uses: mozilla-actions/sccache-action@v0.0.3
@@ -151,6 +152,12 @@ jobs:
             ~/.cargo/registry
             ~/.cargo/git
 
+      - name: Run cargo clippy check
+        run: cargo clippy -- -Dwarnings
+
+      - name: Run cargo tests
+        run: cargo test
+
       - name: Bulid release binary
         run: cargo build --release --target ${{ matrix.target }}
 
diff --git a/crates/ctranslate2-bindings/build.rs b/crates/ctranslate2-bindings/build.rs
index 6ac5585..6529bf6 100644
--- a/crates/ctranslate2-bindings/build.rs
+++ b/crates/ctranslate2-bindings/build.rs
@@ -58,11 +58,9 @@ fn link_static() -> PathBuf {
     let dst = config.build();
 
     // Read static lib from generated deps.
-    let cmake_generated_libs_str = std::fs::read_to_string(
-        &format!("/{}/build/cmake_generated_libs", dst.display()).to_string(),
-    )
-    .unwrap();
+    let cmake_generated_libs_str =
+        std::fs::read_to_string(format!("/{}/build/cmake_generated_libs", dst.display())).unwrap();
     read_cmake_generated(&cmake_generated_libs_str);
 
-    return dst;
+    dst
 }
diff --git a/crates/tabby-common/src/events.rs b/crates/tabby-common/src/events.rs
index d454f82..6ee30bc 100644
--- a/crates/tabby-common/src/events.rs
+++ b/crates/tabby-common/src/events.rs
@@ -67,7 +67,7 @@ impl Event<'_> {
             writer.by_ref(),
         )
         .unwrap();
-        write!(writer, "\n").unwrap();
+        writeln!(writer).unwrap();
         writer.flush().unwrap();
     }
 }
diff --git a/crates/tabby-common/src/path.rs b/crates/tabby-common/src/path.rs
index a837d75..67459ca 100644
--- a/crates/tabby-common/src/path.rs
+++ b/crates/tabby-common/src/path.rs
@@ -33,11 +33,11 @@ impl ModelDir {
     }
 
     pub fn metadata_file(&self) -> String {
-        return self.path_string("metadata.json");
+        self.path_string("metadata.json")
     }
 
     pub fn tokenizer_file(&self) -> String {
-        return self.path_string("tokenizer.json");
+        self.path_string("tokenizer.json")
     }
 
     pub fn ctranslate2_dir(&self) -> String {
diff --git a/crates/tabby/src/download/metadata.rs b/crates/tabby/src/download/metadata.rs
index 9f21d93..d46d3b8 100644
--- a/crates/tabby/src/download/metadata.rs
+++ b/crates/tabby/src/download/metadata.rs
@@ -1,4 +1,4 @@
-use anyhow::{anyhow, Result};
+use anyhow::Result;
 use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
 use std::fs;
@@ -17,10 +17,14 @@ struct HFMetadata {
 }
 
 impl HFMetadata {
-    async fn from(model_id: &str) -> Result<HFMetadata> {
+    async fn from(model_id: &str) -> HFMetadata {
         let api_url = format!("https://huggingface.co/api/models/{}", model_id);
-        let metadata = reqwest::get(api_url).await?.json::<HFMetadata>().await?;
-        Ok(metadata)
+        reqwest::get(&api_url)
+            .await
+            .unwrap_or_else(|_| panic!("Failed to GET url '{}'", api_url))
+            .json::<HFMetadata>()
+            .await
+            .unwrap_or_else(|_| panic!("Failed to parse HFMetadata '{}'", api_url))
     }
 }
 
@@ -31,16 +35,15 @@ pub struct Metadata {
 }
 
 impl Metadata {
-    pub async fn from(model_id: &str) -> Result<Metadata> {
+    pub async fn from(model_id: &str) -> Metadata {
         if let Some(metadata) = Self::from_local(model_id) {
-            Ok(metadata)
+            metadata
         } else {
-            let hf_metadata = HFMetadata::from(model_id).await?;
-            let metadata = Metadata {
+            let hf_metadata = HFMetadata::from(model_id).await;
+            Metadata {
                 auto_model: hf_metadata.transformers_info.auto_model,
                 etags: HashMap::new(),
-            };
-            Ok(metadata)
+            }
         }
     }
 
@@ -54,28 +57,20 @@ impl Metadata {
         }
     }
 
-    pub fn has_etag(&self, url: &str) -> bool {
-        self.etags.get(url).is_some()
+    pub fn local_cache_key(&self, path: &str) -> Option<&str> {
+        self.etags.get(path).map(|x| x.as_str())
     }
 
-    pub async fn match_etag(&self, url: &str, path: &str) -> Result<bool> {
-        let etag = self
-            .etags
-            .get(url)
-            .ok_or(anyhow!("Path doesn't exist: {}", path))?;
-        let etag_from_header = reqwest::get(url)
-            .await?
-            .headers()
+    pub fn remote_cache_key(res: &reqwest::Response) -> &str {
+        res.headers()
             .get("etag")
-            .ok_or(anyhow!("URL doesn't have etag header: '{}'", url))?
-            .to_str()?
-            .to_owned();
-
-        Ok(etag == &etag_from_header)
+            .unwrap_or_else(|| panic!("Failed to GET ETAG header from '{}'", res.url()))
+            .to_str()
+            .unwrap_or_else(|_| panic!("Failed to convert ETAG header into string '{}'", res.url()))
     }
 
-    pub async fn update_etag(&mut self, url: &str, path: &str) {
-        self.etags.insert(url.to_owned(), path.to_owned());
+    pub async fn set_local_cache_key(&mut self, path: &str, cache_key: &str) {
+        self.etags.insert(path.to_string(), cache_key.to_string());
     }
 
     pub fn save(&self, model_id: &str) -> Result<()> {
@@ -92,7 +87,7 @@ mod tests {
 
     #[tokio::test]
     async fn test_hf() {
-        let hf_metadata = HFMetadata::from("TabbyML/J-350M").await.unwrap();
+        let hf_metadata = HFMetadata::from("TabbyML/J-350M").await;
         assert_eq!(
             hf_metadata.transformers_info.auto_model,
             "AutoModelForCausalLM"
diff --git a/crates/tabby/src/download/mod.rs b/crates/tabby/src/download/mod.rs
index f3e48d6..49fc258 100644
--- a/crates/tabby/src/download/mod.rs
+++ b/crates/tabby/src/download/mod.rs
@@ -1,6 +1,5 @@
 mod metadata;
 
-use anyhow::{anyhow, Result};
 use std::cmp;
 use std::fs;
 use std::io::Write;
@@ -18,111 +17,108 @@ pub struct DownloadArgs {
     model: String,
 
     /// If true, skip checking for remote model file.
-    #[clap(long, default_value_t = true)]
+    #[clap(long, default_value_t = false)]
     prefer_local_file: bool,
 }
 
-pub async fn main(args: &DownloadArgs) -> Result<()> {
-    download_model(&args.model, args.prefer_local_file).await?;
-    Ok(())
+pub async fn main(args: &DownloadArgs) {
+    download_model(&args.model, args.prefer_local_file).await;
+    println!("model '{}' is ready", args.model);
 }
 
 impl metadata::Metadata {
-    async fn download(
-        &mut self,
-        model_id: &str,
-        path: &str,
-        prefer_local_file: bool,
-    ) -> Result<()> {
+    async fn download(&mut self, model_id: &str, path: &str, prefer_local_file: bool) {
         // Create url.
         let url = format!("https://huggingface.co/{}/resolve/main/{}", model_id, path);
 
+        // Get cache key.
+        let local_cache_key = self.local_cache_key(path);
+
         // Create destination path.
         let filepath = ModelDir::new(model_id).path_string(path);
 
         // Cache hit.
-        let mut cache_hit = false;
-        if fs::metadata(&filepath).is_ok() && self.has_etag(&url) {
-            if prefer_local_file || self.match_etag(&url, path).await? {
-                cache_hit = true
-            }
+        let mut local_file_ready = false;
+        if !prefer_local_file && local_cache_key.is_some() && fs::metadata(&filepath).is_ok() {
+            local_file_ready = true;
         }
 
-        if !cache_hit {
-            let etag = download_file(&url, &filepath).await?;
-            self.update_etag(&url, &etag).await
+        if !local_file_ready {
+            let etag = download_file(&url, &filepath, local_cache_key).await;
+            self.set_local_cache_key(path, &etag).await
         }
-
-        Ok(())
     }
 }
 
-pub async fn download_model(model_id: &str, prefer_local_file: bool) -> Result<()> {
-    let mut metadata = metadata::Metadata::from(model_id).await?;
+pub async fn download_model(model_id: &str, prefer_local_file: bool) {
+    let mut metadata = metadata::Metadata::from(model_id).await;
 
     metadata
         .download(model_id, "tokenizer.json", prefer_local_file)
-        .await?;
+        .await;
     metadata
         .download(model_id, "ctranslate2/config.json", prefer_local_file)
-        .await?;
+        .await;
     metadata
         .download(model_id, "ctranslate2/vocabulary.txt", prefer_local_file)
-        .await?;
+        .await;
     metadata
         .download(
             model_id,
             "ctranslate2/shared_vocabulary.txt",
             prefer_local_file,
         )
-        .await?;
+        .await;
     metadata
         .download(model_id, "ctranslate2/model.bin", prefer_local_file)
-        .await?;
-    metadata.save(model_id)?;
-    Ok(())
+        .await;
+    metadata
+        .save(model_id)
+        .unwrap_or_else(|_| panic!("Failed to save model_id '{}'", model_id));
 }
 
-async fn download_file(url: &str, path: &str) -> Result<String> {
-    fs::create_dir_all(Path::new(path).parent().unwrap())?;
+async fn download_file(url: &str, path: &str, local_cache_key: Option<&str>) -> String {
+    fs::create_dir_all(Path::new(path).parent().unwrap())
+        .unwrap_or_else(|_| panic!("Failed to create path '{}'", path));
 
     // Reqwest setup
     let res = reqwest::get(url)
         .await
-        .or(Err(anyhow!("Failed to GET from '{}'", url)))?;
+        .unwrap_or_else(|_| panic!("Failed to GET from '{}'", url));
 
-    let etag = res
-        .headers()
-        .get("etag")
-        .ok_or(anyhow!("Failed to get etag from '{}", url))?
-        .to_str()?
-        .to_string();
+    let remote_cache_key = metadata::Metadata::remote_cache_key(&res).to_string();
+    if let Some(local_cache_key) = local_cache_key {
+        if local_cache_key == remote_cache_key {
+            return remote_cache_key;
+        }
+    }
 
     let total_size = res
         .content_length()
-        .ok_or(anyhow!("Failed to get content length from '{}'", url))?;
+        .unwrap_or_else(|| panic!("Failed to get content length from '{}'", url));
 
     // Indicatif setup
     let pb = ProgressBar::new(total_size);
     pb.set_style(ProgressStyle::default_bar()
-        .template("{msg}\n{spinner:.green} [{elapsed_precise}] [{wide_bar:.cyan/blue}] {bytes}/{total_bytes} ({bytes_per_sec}, {eta})")?
+        .template("{msg}\n{spinner:.green} [{elapsed_precise}] [{wide_bar:.cyan/blue}] {bytes}/{total_bytes} ({bytes_per_sec}, {eta})")
+        .expect("Invalid progress style")
         .progress_chars("#>-"));
     pb.set_message(format!("Downloading {}", path));
 
     // download chunks
-    let mut file = fs::File::create(&path).or(Err(anyhow!("Failed to create file '{}'", &path)))?;
+    let mut file =
+        fs::File::create(path).unwrap_or_else(|_| panic!("Failed to create file '{}'", path));
     let mut downloaded: u64 = 0;
     let mut stream = res.bytes_stream();
 
     while let Some(item) = stream.next().await {
-        let chunk = item.or(Err(anyhow!("Error while downloading file")))?;
-        file.write_all(&chunk)
-            .or(Err(anyhow!("Error while writing to file")))?;
+        let chunk = item.expect("Error while downloading file");
+        file.write_all(&chunk).expect("Error while writing to file");
         let new = cmp::min(downloaded + (chunk.len() as u64), total_size);
         downloaded = new;
         pb.set_position(new);
     }
 
     pb.finish_with_message(format!("Downloaded {}", path));
-    return Ok(etag);
+    remote_cache_key
 }
diff --git a/crates/tabby/src/main.rs b/crates/tabby/src/main.rs
index d7d9d80..2d10ef4 100644
--- a/crates/tabby/src/main.rs
+++ b/crates/tabby/src/main.rs
@@ -25,15 +25,7 @@ async fn main() {
     let cli = Cli::parse();
 
     match &cli.command {
-        Commands::Serve(args) => {
-            serve::main(args)
-                .await
-                .expect("Error happens during the serve");
-        }
-        Commands::Download(args) => {
-            download::main(args)
-                .await
-                .expect("Error happens during the download");
-        }
+        Commands::Serve(args) => serve::main(args).await,
+        Commands::Download(args) => download::main(args).await,
     }
 }
diff --git a/crates/tabby/src/serve/admin.rs b/crates/tabby/src/serve/admin.rs
index c98faa5..357c05a 100644
--- a/crates/tabby/src/serve/admin.rs
+++ b/crates/tabby/src/serve/admin.rs
@@ -26,12 +26,12 @@ where
                 Response::builder()
                     .header(header::CONTENT_TYPE, mime.as_ref())
                     .body(body)
-                    .unwrap()
+                    .expect("Invalid response")
             }
             None => Response::builder()
                 .status(StatusCode::NOT_FOUND)
                 .body(boxed(Full::from("404")))
-                .unwrap(),
+                .expect("Invalid response"),
         }
     }
 }
diff --git a/crates/tabby/src/serve/completions.rs b/crates/tabby/src/serve/completions.rs
index 46d79ea..fe0ffea 100644
--- a/crates/tabby/src/serve/completions.rs
+++ b/crates/tabby/src/serve/completions.rs
@@ -45,7 +45,7 @@ pub async fn completion(
         .max_decoding_length(64)
         .sampling_temperature(0.2)
         .build()
-        .unwrap();
+        .expect("Invalid TextInferenceOptions");
     let text = state.engine.inference(&request.prompt, options);
     let language = request.language.unwrap_or("unknown".into());
     let filtered_text = languages::remove_stop_words(&language, &text);
@@ -90,7 +90,7 @@ impl CompletionState {
             .device_indices(args.device_indices.clone())
             .num_replicas_per_device(args.num_replicas_per_device)
             .build()
-            .unwrap();
+            .expect("Invalid TextInferenceEngineCreateOptions");
         let engine = TextInferenceEngine::create(options);
         Self { engine }
     }
@@ -110,5 +110,5 @@ struct Metadata {
 }
 
 fn read_metadata(model_dir: &ModelDir) -> Metadata {
-    serdeconv::from_json_file(model_dir.metadata_file()).unwrap()
+    serdeconv::from_json_file(model_dir.metadata_file()).expect("Invalid metadata")
 }
diff --git a/crates/tabby/src/serve/mod.rs b/crates/tabby/src/serve/mod.rs
index 98402de..895a133 100644
--- a/crates/tabby/src/serve/mod.rs
+++ b/crates/tabby/src/serve/mod.rs
@@ -3,7 +3,6 @@ mod completions;
 mod events;
 
 use crate::Cli;
-use anyhow::Result;
 use axum::{routing, Router, Server};
 use clap::{error::ErrorKind, Args, CommandFactory};
 use std::{
@@ -29,10 +28,10 @@ struct ApiDoc;
 #[derive(clap::ValueEnum, strum::Display, PartialEq, Clone)]
 pub enum Device {
     #[strum(serialize = "cpu")]
-    CPU,
+    Cpu,
 
     #[strum(serialize = "cuda")]
-    CUDA,
+    Cuda,
 }
 
 #[derive(Args)]
@@ -45,7 +44,7 @@ pub struct ServeArgs {
     port: u16,
 
     /// Device to run model inference.
-    #[clap(long, default_value_t=Device::CPU)]
+    #[clap(long, default_value_t=Device::Cpu)]
     device: Device,
 
     /// GPU indices to run models, only applicable for CUDA.
@@ -61,11 +60,11 @@ pub struct ServeArgs {
     experimental_admin_panel: bool,
 }
 
-pub async fn main(args: &ServeArgs) -> Result<()> {
-    valid_args(args)?;
+pub async fn main(args: &ServeArgs) {
+    valid_args(args);
 
     // Ensure model exists.
-    crate::download::download_model(&args.model, true).await?;
+    crate::download::download_model(&args.model, true).await;
 
     let app = Router::new()
         .merge(SwaggerUi::new("/swagger-ui").url("/api-docs/openapi.json", ApiDoc::openapi()))
@@ -77,8 +76,8 @@ pub async fn main(args: &ServeArgs) -> Result<()> {
     println!("Listening at {}", address);
     Server::bind(&address)
         .serve(app.into_make_service())
-        .await?;
-    Ok(())
+        .await
+        .expect("Error happends during model serving")
 }
 
 fn api_router(args: &ServeArgs) -> Router {
@@ -99,8 +98,8 @@ fn fallback(experimental_admin_panel: bool) -> routing::MethodRouter {
     }
 }
 
-fn valid_args(args: &ServeArgs) -> Result<()> {
-    if args.device == Device::CUDA && args.num_replicas_per_device != 1 {
+fn valid_args(args: &ServeArgs) {
+    if args.device == Device::Cuda && args.num_replicas_per_device != 1 {
         Cli::command()
             .error(
                 ErrorKind::ValueValidation,
@@ -109,7 +108,7 @@ fn valid_args(args: &ServeArgs) -> Result<()> {
             .exit();
     }
 
-    if args.device == Device::CPU && (args.device_indices.len() != 1 || args.device_indices[0] != 0)
+    if args.device == Device::Cpu && (args.device_indices.len() != 1 || args.device_indices[0] != 0)
     {
         Cli::command()
             .error(
@@ -118,6 +117,4 @@ fn valid_args(args: &ServeArgs) -> Result<()> {
             )
             .exit();
     }
-
-    Ok(())
 }