diff --git a/meilisearch-http/Cargo.toml b/meilisearch-http/Cargo.toml
index c7331b871..e3c858980 100644
--- a/meilisearch-http/Cargo.toml
+++ b/meilisearch-http/Cargo.toml
@@ -14,6 +14,13 @@ name = "meilisearch"
 path = "src/main.rs"
 
 [dependencies]
+actix-cors = "0.2.0"
+actix-files = "0.2.1"
+actix-http = "1"
+actix-rt = "1"
+actix-service = "1.0.5"
+actix-web = "2"
+actix-web-macros = "0.1.0"
 chrono = { version = "0.4.11", features = ["serde"] }
 crossbeam-channel = "0.4.2"
 env_logger = "0.7.1"
@@ -34,20 +41,13 @@ serde_json = { version = "1.0.50", features = ["preserve_order"] }
 serde_qs = "0.5.2"
 sha2 = "0.8.1"
 siphasher = "0.3.2"
+slice-group-by = "0.2.6"
 structopt = "0.3.12"
 sysinfo = "0.12.0"
+tokio = { version = "0.2.18", features = ["macros"] }
 ureq = { version = "0.12.0", features = ["tls"], default-features = false }
 walkdir = "2.3.1"
 whoami = "0.8.1"
-slice-group-by = "0.2.6"
-actix-rt = "1"
-actix-web = "2"
-actix-http = "1"
-actix-files = "0.2.1"
-actix-cors = "0.2.0"
-actix-service = "1.0.5"
-actix-web-macros = "0.1.0"
-tokio = { version = "0.2.18", features = ["macros"] }
 
 [dev-dependencies]
 http-service = "0.4.0"
diff --git a/meilisearch-http/src/data.rs b/meilisearch-http/src/data.rs
index 97a3526a7..cdfdfb80d 100644
--- a/meilisearch-http/src/data.rs
+++ b/meilisearch-http/src/data.rs
@@ -37,7 +37,7 @@ pub struct DataInner {
     pub server_pid: Pid,
 }
 
-#[derive(Default, Clone)]
+#[derive(Clone)]
 pub struct ApiKeys {
     pub public: Option<String>,
     pub private: Option<String>,
diff --git a/meilisearch-http/src/error.rs b/meilisearch-http/src/error.rs
index db0ce6c2d..638726ece 100644
--- a/meilisearch-http/src/error.rs
+++ b/meilisearch-http/src/error.rs
@@ -91,11 +91,11 @@ impl fmt::Display for ResponseError {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
             Self::BadParameter(param, err) => write!(f, "Url parameter {} error: {}", param, err),
-            Self::BadRequest(err) => write!(f, "{}", err),
+            Self::BadRequest(err) => f.write_str(err),
             Self::CreateIndex(err) => write!(f, "Impossible to create index; {}", err),
             Self::DocumentNotFound(document_id) => write!(f, "Document with id {} not found", document_id),
             Self::IndexNotFound(index_uid) => write!(f, "Index {} not found", index_uid),
-            Self::Internal(err) => write!(f, "{}", err),
+            Self::Internal(err) => f.write_str(err),
             Self::InvalidIndexUid => f.write_str("Index must have a valid uid; Index uid can be of type integer or string only composed of alphanumeric characters, hyphens (-) and underscores (_)."),
             Self::InvalidToken(err) => write!(f, "Invalid API key: {}", err),
             Self::Maintenance => f.write_str("Server is in maintenance, please try again later"),
diff --git a/meilisearch-http/src/helpers/authentication.rs b/meilisearch-http/src/helpers/authentication.rs
index f91b7c3c5..f42898683 100644
--- a/meilisearch-http/src/helpers/authentication.rs
+++ b/meilisearch-http/src/helpers/authentication.rs
@@ -33,7 +33,7 @@ where
 
     fn new_transform(&self, service: S) -> Self::Future {
         ok(LoggingMiddleware {
-            acl: (*self).clone(),
+            acl: self.clone(),
             service: Rc::new(RefCell::new(service)),
         })
     }
@@ -61,6 +61,8 @@ where
 
     fn call(&mut self, req: ServiceRequest) -> Self::Future {
         let mut svc = self.service.clone();
+        // This unwrap is left because this error should never appear. If that's the case, then
+        // it means that actix-web has an issue or someone changes the type `Data`.
         let data = req.app_data::<Data>().unwrap();
 
         if data.api_keys.master.is_none() {
diff --git a/meilisearch-http/src/main.rs b/meilisearch-http/src/main.rs
index 637bfaddb..620571bfc 100644
--- a/meilisearch-http/src/main.rs
+++ b/meilisearch-http/src/main.rs
@@ -18,8 +18,6 @@ static ALLOC: jemallocator::Jemalloc = jemallocator::Jemalloc;
 #[actix_rt::main]
 async fn main() -> Result<(), MainError> {
     let opt = Opt::from_args();
-    // let local = tokio::task::LocalSet::new();
-    // let _sys = actix_rt::System::run_in_tokio("server", &local);
 
     match opt.env.as_ref() {
         "production" => {
diff --git a/meilisearch-http/src/routes/document.rs b/meilisearch-http/src/routes/document.rs
index eea5d760d..6fab12570 100644
--- a/meilisearch-http/src/routes/document.rs
+++ b/meilisearch-http/src/routes/document.rs
@@ -13,7 +13,7 @@ use crate::Data;
 
 type Document = IndexMap<String, Value>;
 
-#[derive(Default, Deserialize)]
+#[derive(Deserialize)]
 struct DocumentParam {
     index_uid: String,
     document_id: String,
@@ -46,7 +46,7 @@ async fn get_document(
     let reader = data.db.main_read_txn()?;
 
     let response = index
-        .document::<Document>(&reader, None, document_id)?
+        .document(&reader, None, document_id)?
         .ok_or(ResponseError::document_not_found(&path.document_id))?;
 
     Ok(HttpResponse::Ok().json(response))
@@ -78,7 +78,7 @@ async fn delete_document(
     Ok(HttpResponse::Accepted().json(IndexUpdateResponse::with_id(update_id)))
 }
 
-#[derive(Default, Deserialize)]
+#[derive(Deserialize)]
 #[serde(rename_all = "camelCase", deny_unknown_fields)]
 struct BrowseQuery {
     offset: Option<usize>,
@@ -116,9 +116,11 @@ async fn get_all_documents(
         .as_ref()
         .map(|a| a.split(',').collect());
 
-    let mut response = Vec::<Document>::new();
+    let mut response = Vec::new();
     for document_id in documents_ids {
-        if let Ok(Some(document)) = index.document(&reader, attributes.as_ref(), document_id) {
+        if let Ok(Some(document)) =
+            index.document::<Document>(&reader, attributes.as_ref(), document_id)
+        {
             response.push(document);
         }
     }
@@ -135,7 +137,7 @@ fn find_primary_key(document: &IndexMap<String, Value>) -> Option<String> {
     None
 }
 
-#[derive(Default, Deserialize)]
+#[derive(Deserialize)]
 #[serde(rename_all = "camelCase", deny_unknown_fields)]
 struct UpdateDocumentsQuery {
     primary_key: Option<String>,
@@ -171,7 +173,9 @@ async fn update_multiple_documents(
 
         let mut writer = data.db.main_write_txn()?;
 
-        schema.set_primary_key(&id)?;
+        schema
+            .set_primary_key(&id)
+            .map_err(ResponseError::bad_request)?;
         index.main.put_schema(&mut writer, &schema)?;
         writer.commit()?;
     }
diff --git a/meilisearch-http/src/routes/index.rs b/meilisearch-http/src/routes/index.rs
index b664d0121..d43967bdd 100644
--- a/meilisearch-http/src/routes/index.rs
+++ b/meilisearch-http/src/routes/index.rs
@@ -157,13 +157,13 @@ async fn create_index(
         ));
     }
 
-    let uid = match body.uid.clone() {
+    let uid = match &body.uid {
         Some(uid) => {
             if uid
                 .chars()
                 .all(|x| x.is_ascii_alphanumeric() || x == '-' || x == '_')
             {
-                uid
+                uid.to_owned()
             } else {
                 return Err(ResponseError::InvalidIndexUid);
             }
@@ -183,8 +183,8 @@ async fn create_index(
 
     let mut writer = data.db.main_write_txn()?;
 
-    let name = body.name.clone().unwrap_or(uid.clone());
-    created_index.main.put_name(&mut writer, &name)?;
+    let name = body.name.as_ref().unwrap_or(&uid);
+    created_index.main.put_name(&mut writer, name)?;
 
     let created_at = created_index
         .main
@@ -208,7 +208,7 @@ async fn create_index(
     writer.commit()?;
 
     Ok(HttpResponse::Created().json(IndexResponse {
-        name,
+        name: name.to_string(),
         uid,
         created_at,
         updated_at,
@@ -246,8 +246,8 @@ async fn update_index(
 
     let mut writer = data.db.main_write_txn()?;
 
-    if let Some(name) = body.name.clone() {
-        index.main.put_name(&mut writer, &name)?;
+    if let Some(name) = &body.name {
+        index.main.put_name(&mut writer, name)?;
     }
 
     if let Some(id) = body.primary_key.clone() {
@@ -314,7 +314,7 @@ async fn delete_index(
     Ok(HttpResponse::NoContent().finish())
 }
 
-#[derive(Default, Deserialize)]
+#[derive(Deserialize)]
 struct UpdateParam {
     index_uid: String,
     update_id: u64,
diff --git a/meilisearch-http/src/routes/key.rs b/meilisearch-http/src/routes/key.rs
index 7cca1bbb1..46e59cd6b 100644
--- a/meilisearch-http/src/routes/key.rs
+++ b/meilisearch-http/src/routes/key.rs
@@ -1,4 +1,5 @@
 use actix_web::web;
+use actix_web::HttpResponse;
 use actix_web_macros::get;
 use serde::Serialize;
 
@@ -9,16 +10,16 @@ pub fn services(cfg: &mut web::ServiceConfig) {
     cfg.service(list);
 }
 
-#[derive(Default, Serialize)]
+#[derive(Serialize)]
 struct KeysResponse {
     private: Option<String>,
     public: Option<String>,
 }
 
 #[get("/keys", wrap = "Authentication::Admin")]
-async fn list(data: web::Data<Data>) -> web::Json<KeysResponse> {
+async fn list(data: web::Data<Data>) -> HttpResponse {
     let api_keys = data.api_keys.clone();
-    web::Json(KeysResponse {
+    HttpResponse::Ok().json(KeysResponse {
         private: api_keys.private,
         public: api_keys.public,
     })
diff --git a/meilisearch-http/src/routes/mod.rs b/meilisearch-http/src/routes/mod.rs
index 33b71c684..a63e0dc75 100644
--- a/meilisearch-http/src/routes/mod.rs
+++ b/meilisearch-http/src/routes/mod.rs
@@ -11,12 +11,12 @@ pub mod stats;
 pub mod stop_words;
 pub mod synonym;
 
-#[derive(Default, Deserialize)]
+#[derive(Deserialize)]
 pub struct IndexParam {
     index_uid: String,
 }
 
-#[derive(Default, Serialize)]
+#[derive(Serialize)]
 #[serde(rename_all = "camelCase")]
 pub struct IndexUpdateResponse {
     pub update_id: u64,
diff --git a/meilisearch-http/src/routes/search.rs b/meilisearch-http/src/routes/search.rs
index e64550448..1189e79a8 100644
--- a/meilisearch-http/src/routes/search.rs
+++ b/meilisearch-http/src/routes/search.rs
@@ -2,11 +2,12 @@ use std::collections::{HashSet, HashMap};
 
 use log::warn;
 use actix_web::web;
+use actix_web::HttpResponse;
 use actix_web_macros::get;
 use serde::Deserialize;
 
 use crate::error::ResponseError;
-use crate::helpers::meilisearch::{IndexSearchExt, SearchResult};
+use crate::helpers::meilisearch::IndexSearchExt;
 use crate::helpers::Authentication;
 use crate::routes::IndexParam;
 use crate::Data;
@@ -34,7 +35,7 @@ async fn search_with_url_query(
     data: web::Data<Data>,
     path: web::Path<IndexParam>,
     params: web::Query<SearchQuery>,
-) -> Result<web::Json<SearchResult>, ResponseError> {
+) -> Result<HttpResponse, ResponseError> {
     let index = data
         .db
         .open_index(&path.index_uid)
@@ -137,5 +138,5 @@ async fn search_with_url_query(
         }
     }
 
-    Ok(web::Json(search_builder.search(&reader)?))
+    Ok(HttpResponse::Ok().json(search_builder.search(&reader)?))
 }
diff --git a/meilisearch-http/src/routes/setting.rs b/meilisearch-http/src/routes/setting.rs
index 2af339931..262af8b84 100644
--- a/meilisearch-http/src/routes/setting.rs
+++ b/meilisearch-http/src/routes/setting.rs
@@ -94,14 +94,14 @@ async fn get_all(
     let searchable_attributes = schema.clone().map(|s| {
         s.indexed_name()
             .iter()
-            .map(|s| (*s).to_string())
+            .map(|s| s.to_string())
             .collect::<Vec<String>>()
     });
 
     let displayed_attributes = schema.clone().map(|s| {
         s.displayed_name()
             .iter()
-            .map(|s| (*s).to_string())
+            .map(|s| s.to_string())
             .collect::<HashSet<String>>()
     });
 
@@ -312,7 +312,7 @@ async fn get_searchable(
     let reader = data.db.main_read_txn()?;
     let schema = index.main.schema(&reader)?;
     let searchable_attributes: Option<Vec<String>> =
-        schema.map(|s| s.indexed_name().iter().map(|i| (*i).to_string()).collect());
+        schema.map(|s| s.indexed_name().iter().map(|i| i.to_string()).collect());
 
     Ok(HttpResponse::Ok().json(searchable_attributes))
 }
@@ -385,12 +385,8 @@ async fn get_displayed(
 
     let schema = index.main.schema(&reader)?;
 
-    let displayed_attributes: Option<HashSet<String>> = schema.map(|s| {
-        s.displayed_name()
-            .iter()
-            .map(|i| (*i).to_string())
-            .collect()
-    });
+    let displayed_attributes: Option<HashSet<String>> =
+        schema.map(|s| s.displayed_name().iter().map(|i| i.to_string()).collect());
 
     Ok(HttpResponse::Ok().json(displayed_attributes))
 }
diff --git a/meilisearch-http/src/routes/stats.rs b/meilisearch-http/src/routes/stats.rs
index 8a793f9bb..92945e588 100644
--- a/meilisearch-http/src/routes/stats.rs
+++ b/meilisearch-http/src/routes/stats.rs
@@ -1,6 +1,7 @@
 use std::collections::HashMap;
 
 use actix_web::web;
+use actix_web::HttpResponse;
 use actix_web_macros::get;
 use chrono::{DateTime, Utc};
 use log::error;
@@ -34,7 +35,7 @@ struct IndexStatsResponse {
 async fn index_stats(
     data: web::Data<Data>,
     path: web::Path<IndexParam>,
-) -> Result<web::Json<IndexStatsResponse>, ResponseError> {
+) -> Result<HttpResponse, ResponseError> {
     let index = data
         .db
         .open_index(&path.index_uid)
@@ -48,11 +49,13 @@ async fn index_stats(
 
     let update_reader = data.db.update_read_txn()?;
 
-    let is_indexing = data
-        .is_indexing(&update_reader, &path.index_uid)?
-        .unwrap_or_default();
+    let is_indexing =
+        data.is_indexing(&update_reader, &path.index_uid)?
+            .ok_or(ResponseError::internal(
+                "Impossible to know if the database is indexing",
+            ))?;
 
-    Ok(web::Json(IndexStatsResponse {
+    Ok(HttpResponse::Ok().json(IndexStatsResponse {
         number_of_documents,
         is_indexing,
         fields_frequency,
@@ -68,7 +71,7 @@ struct StatsResult {
 }
 
 #[get("/stats", wrap = "Authentication::Private")]
-async fn get_stats(data: web::Data<Data>) -> Result<web::Json<StatsResult>, ResponseError> {
+async fn get_stats(data: web::Data<Data>) -> Result<HttpResponse, ResponseError> {
     let mut index_list = HashMap::new();
 
     let reader = data.db.main_read_txn()?;
@@ -83,9 +86,9 @@ async fn get_stats(data: web::Data<Data>) -> Result<web::Json<StatsResult>, Resp
 
                 let fields_frequency = index.main.fields_frequency(&reader)?.unwrap_or_default();
 
-                let is_indexing = data
-                    .is_indexing(&update_reader, &index_uid)?
-                    .unwrap_or_default();
+                let is_indexing = data.is_indexing(&update_reader, &index_uid)?.ok_or(
+                    ResponseError::internal("Impossible to know if the database is indexing"),
+                )?;
 
                 let response = IndexStatsResponse {
                     number_of_documents,
@@ -110,7 +113,7 @@ async fn get_stats(data: web::Data<Data>) -> Result<web::Json<StatsResult>, Resp
 
     let last_update = data.last_update(&reader)?;
 
-    Ok(web::Json(StatsResult {
+    Ok(HttpResponse::Ok().json(StatsResult {
         database_size,
         last_update,
         indexes: index_list,
@@ -126,8 +129,8 @@ struct VersionResponse {
 }
 
 #[get("/version", wrap = "Authentication::Private")]
-async fn get_version() -> web::Json<VersionResponse> {
-    web::Json(VersionResponse {
+async fn get_version() -> HttpResponse {
+    HttpResponse::Ok().json(VersionResponse {
         commit_sha: env!("VERGEN_SHA").to_string(),
         build_date: env!("VERGEN_BUILD_TIMESTAMP").to_string(),
         pkg_version: env!("CARGO_PKG_VERSION").to_string(),
@@ -195,7 +198,7 @@ impl SysInfo {
 }
 
 #[get("/sys-info", wrap = "Authentication::Private")]
-async fn get_sys_info(data: web::Data<Data>) -> web::Json<SysInfo> {
+async fn get_sys_info(data: web::Data<Data>) -> HttpResponse {
     let mut sys = System::new();
     let mut info = SysInfo::new();
 
@@ -226,7 +229,7 @@ async fn get_sys_info(data: web::Data<Data>) -> web::Json<SysInfo> {
     }
 
     sys.refresh_all();
-    web::Json(info)
+    HttpResponse::Ok().json(info)
 }
 
 #[derive(Serialize)]
@@ -290,7 +293,7 @@ impl SysInfoPretty {
 }
 
 #[get("/sys-info/pretty", wrap = "Authentication::Private")]
-async fn get_sys_info_pretty(data: web::Data<Data>) -> web::Json<SysInfoPretty> {
+async fn get_sys_info_pretty(data: web::Data<Data>) -> HttpResponse {
     let mut sys = System::new();
     let mut info = SysInfoPretty::new();
 
@@ -328,5 +331,5 @@ async fn get_sys_info_pretty(data: web::Data<Data>) -> web::Json<SysInfoPretty>
 
     sys.refresh_all();
 
-    web::Json(info)
+    HttpResponse::Ok().json(info)
 }