diff --git a/bin/u_server/src/main.rs b/bin/u_server/src/main.rs
index 00ed177..a14710b 100644
--- a/bin/u_server/src/main.rs
+++ b/bin/u_server/src/main.rs
@@ -37,7 +37,6 @@ async fn main() {
         .and_then(handlers::listing);
 
     let auth_token = warp::header::exact("authorization", "Bearer 123qwe");
-        //.and_then(handlers::check_token);
 
     let auth_zone = auth_token.and(ls);
 
diff --git a/build_static_docker.sh b/build_static_docker.sh
deleted file mode 100755
index 872696e..0000000
--- a/build_static_docker.sh
+++ /dev/null
@@ -1,2 +0,0 @@
-#!/bin/bash
-docker run -v $PWD:/volume  -w /volume -it clux/muslrust cargo build
diff --git a/cargo_static_docker.sh b/cargo_static_docker.sh
new file mode 100755
index 0000000..f0171fa
--- /dev/null
+++ b/cargo_static_docker.sh
@@ -0,0 +1,8 @@
+#!/bin/bash
+docker run \
+    -v $PWD:/volume \
+    -v cargo-cache:/root/.cargo/registry \
+    -w /volume \
+    -it \
+    clux/muslrust \
+    cargo $@
diff --git a/lib/u_lib/src/client/client.rs b/lib/u_lib/src/client/client.rs
index b9f2d4e..2c568fc 100644
--- a/lib/u_lib/src/client/client.rs
+++ b/lib/u_lib/src/client/client.rs
@@ -1,6 +1,5 @@
 use std::{
-    collections::HashMap,
-    fmt
+    collections::HashMap
 };
 
 use serde::{
@@ -39,7 +38,7 @@ impl ClientInfo {
             let job_result = exec_job(&mut job_meta);
             let job_data = match job_result.data {
                 Ok(output) => output.multiline(),
-                Err(e) => e.description()
+                Err(e) => e.to_string()
             };
             info.insert(job.0.into(), job_data);
         }
@@ -67,14 +66,16 @@ const DEFAULT_JOBS: &[(&str, &str)] = &[
 #[cfg(test)]
 mod tests {
     use super::*;
+    use crate::utils::vec_to_string;
 
     #[test]
     fn test_gather() {
         let cli_info = ClientInfo::gather();
         let field = cli_info.get_field("username").unwrap();
+        let stdout = JobOutput::from_multiline(field).unwrap().stdout;
         assert_eq!(
-            JobOutput::from_multiline(field).unwrap().stdout,
-            b"plazmoid".to_vec()
+            &vec_to_string(&stdout),
+            "plazmoid"
         )
     }
 
diff --git a/lib/u_lib/src/client/network.rs b/lib/u_lib/src/client/network.rs
index f45bf3d..a646894 100644
--- a/lib/u_lib/src/client/network.rs
+++ b/lib/u_lib/src/client/network.rs
@@ -2,6 +2,7 @@ use crate::{
     MASTER_SERVER,
     MASTER_PORT,
     contracts::*,
+    UResult
 };
 use reqwest::{
     Client,
@@ -11,13 +12,24 @@ use reqwest::{
 };
 use std::{
     net::Ipv4Addr,
-    str::FromStr
+    str::FromStr,
+    any::Any
 };
 
+pub struct Paths;
+
+impl Paths {
+    pub const LIST: &'static str = "list";
+    pub const NEW: &'static str = "new";
+    //pub const DEL: &'static str = "del";
+    pub const JOB_REQ: &'static str = "job_req";
+    pub const JOB_ANS: &'static str = "job_ans";
+}
+
+
 pub struct ClientHandler {
     base_url: Url,
     client: Client,
-    cli_info: ClientInfo,
     password: Option<String>
 }
 
@@ -28,7 +40,6 @@ impl ClientHandler {
             .unwrap_or(MASTER_SERVER);
         Self {
             client: Client::new(),
-            cli_info: ClientInfo::gather(),
             base_url: Url::parse(
                 &format!("http://{}:{}", master_server, MASTER_PORT)
             ).unwrap(),
@@ -58,28 +69,90 @@ impl ClientHandler {
         self.set_pwd(rb)
     }
 
-    pub async fn init(&self) -> RawMsg { // move to result
-        let response: Response = self.build_post("/new")
-            .json(&self.cli_info.as_message())
+    pub async fn init(&self, param: &ClientInfo) -> UResult<RawMsg> {
+        let response: Response = self.build_post(Paths::NEW)
+            .json(&param.as_message())
             .send()
-            .await
-            .unwrap();
+            .await?;
         let msg = response
             .json::<Message<RawMsg>>()
-            .await
-            .unwrap();
-        msg.into_item().into_owned()
+            .await?;
+        Ok(msg.into_item().into_owned())
     }
 
-    pub async fn list(&self) -> Vec<ClientInfo> {
-        let response: Response = self.build_get("/ls")
+    pub async fn list(&self) -> UResult<Vec<ClientInfo>> {
+        let response: Response = self.build_get(Paths::LIST)
             .send()
-            .await
-            .unwrap();
+            .await?;
         let msg = response
              .json::<Message<Vec<ClientInfo>>>()
-             .await
-             .unwrap();
-        msg.into_item().into_owned()
+             .await?;
+        Ok(msg.into_item().into_owned())
     }
+/*
+    pub async fn del(&self) -> UResult<()> {
+        self.build_post(Paths::DEL).send().await?;
+        Ok(())
+    }*/
 }
+
+// build_handler![path = new, method = "post", param = ClientInfo, result = RawMsg]
+// param and result must impl ToMsg
+macro_rules! build_handler {
+    (
+        path = $path:tt,
+        method = $method:literal,
+        param = $param:ty,
+        result = $result:ty
+    ) => {
+        impl ClientHandler {
+            pub async fn $path(&self, param: &$param) -> UResult<$result> {
+                let builder = match $method {
+                    "post" => ClientHandler::build_post,
+                    "get" => ClientHandler::build_get,
+                    _ => panic!("Method '{}' is not allowed", $method)
+                };
+                let base_request = builder(self, stringify!($path));
+                let request = if let Some(p) = (param as &dyn Any).downcast_ref::<EmptyMsg>() {
+                    base_request
+                } else {
+                    base_request.json(&param.as_message())
+                };
+                let response = request.send().await?;
+                let msg = response
+                    .json::<Message<$result>>()
+                    .await?;
+                Ok(msg.into_item().into_owned())
+            }
+        }
+
+        impl Paths {
+            pub const $path: &'static str = stringify!($path);
+        }
+    };
+
+    (
+        path = $path:tt,
+        method = $method:literal
+    ) => (
+        build_handler!(path = $path, method = $method, param = EmptyMsg, result = EmptyMsg);
+    );
+
+    (
+        path = $path:tt,
+        method = $method:literal,
+        param = $param:ty
+    ) => (
+        build_handler!(path = $path, method = $method, param = $param, result = EmptyMsg);
+    );
+
+    (
+        path = $path:tt,
+        method = $method:literal,
+        result = $result:ty
+    ) => (
+        build_handler!(path = $path, method = $method, param = EmptyMsg, result = $result);
+    );
+}
+
+build_handler!(path = del, method = "post");
diff --git a/lib/u_lib/src/contracts/jobs.rs b/lib/u_lib/src/contracts/jobs.rs
index cb70cbe..ec5f5a8 100644
--- a/lib/u_lib/src/contracts/jobs.rs
+++ b/lib/u_lib/src/contracts/jobs.rs
@@ -10,7 +10,7 @@ use serde::{
 use uuid::Uuid;
 //use tokio::process::Command;
 use super::*;
-use crate::UError;
+use crate::{UError, UErrType};
 
 
 #[derive(Serialize, Deserialize, Clone, Debug)]
@@ -61,10 +61,9 @@ pub struct JobMeta {
 
 impl JobMeta {
     pub fn from_shell(shell_cmd: String) -> Self {
-        let uid = Uuid::new_v4();
         let job_name = shell_cmd.split(" ").nth(0).unwrap();
         Self {
-            id: uid.clone(),
+            id: Uuid::new_v4(),
             name: job_name.to_string(),
             created: SystemTime::now(),
             updated: SystemTime::now(),
@@ -154,8 +153,8 @@ impl ToMsg for JobResult {}
 
 
 pub struct Job<'meta> {
-    pub result: JobResult,
-    pub meta: &'meta mut JobMeta,
+    result: JobResult,
+    meta: &'meta mut JobMeta,
 }
 
 impl<'meta> Job<'meta> {
@@ -210,7 +209,7 @@ impl<'meta> Job<'meta> {
                             }
                             Err(e) => {
                                 self.result.data = Err(
-                                    UError::Raw(e.to_string())
+                                    UError::new(UErrType::JobError, Some(e))
                                 );
                                 self.result.retcode = None;
                             }
@@ -248,7 +247,10 @@ impl<'meta> Job<'meta> {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::execute_jobs;
+    use crate::{
+        execute_jobs,
+        utils::vec_to_string
+    };
 
     #[test]
     fn test_shell_job() {
@@ -257,8 +259,8 @@ mod tests {
         execute_jobs(&mut jobs);
         let job_result = jobs.pop().unwrap().into_result();
         assert_eq!(
-            job_result.data.unwrap().stdout,
-            b"plazmoid\n".to_vec()
+            &vec_to_string(&job_result.data.unwrap().stdout),
+            "plazmoid"
         );
     }
 
@@ -271,4 +273,45 @@ mod tests {
         assert!(job_result.data.is_err());
         assert_eq!(job_result.retcode, None);
     }
+
+    #[test]
+    fn test_to_multiline() {
+        let mut output = JobOutput::new();
+        output.stdout = b"lol".to_vec();
+        output.stderr = b"kek".to_vec();
+        assert_eq!(
+            output.multiline(),
+            String::from(
+                "*** STDOUT ***\n\
+                lol\n\
+                *** STDERR ***\n\
+                kek\n"
+            )
+        )
+    }
+
+    #[test]
+    fn test_to_multiline_stderr_only() {
+        let mut output = JobOutput::new();
+        output.stderr = b"kek".to_vec();
+        assert_eq!(
+            output.multiline(),
+            String::from(
+                "*** STDERR ***\n\
+                kek\n"
+            )
+        )
+    }
+
+    #[test]
+    fn test_from_multiline() {
+        let txt = "*** STDOUT ***\n\
+                    puk\n".to_string();
+        let output = JobOutput::from_multiline(&txt).unwrap();
+        assert_eq!(
+            output.stdout,
+            b"puk".to_vec()
+        );
+        assert_eq!(output.stderr.len(), 0);
+    }
 }
diff --git a/lib/u_lib/src/contracts/messaging.rs b/lib/u_lib/src/contracts/messaging.rs
index 0b27f4a..8ab8182 100644
--- a/lib/u_lib/src/contracts/messaging.rs
+++ b/lib/u_lib/src/contracts/messaging.rs
@@ -54,7 +54,10 @@ where I: Clone {
 #[derive(Serialize, Deserialize, Debug, Clone)]
 pub struct RawMsg(pub String);
 
-impl ToMsg for RawMsg {}
+
+#[derive(Serialize, Deserialize, Debug, Clone)]
+pub struct EmptyMsg;
+
 
 /*
 #[cfg(test)]
diff --git a/lib/u_lib/src/contracts/mod.rs b/lib/u_lib/src/contracts/mod.rs
index 833f09f..4996df4 100644
--- a/lib/u_lib/src/contracts/mod.rs
+++ b/lib/u_lib/src/contracts/mod.rs
@@ -13,9 +13,11 @@ use std::{
     borrow::Cow
 };
 
+macro_rules! to_message {
+    ($($type:ty),+) => { $(
+
+        impl ToMsg for $type {}
 
-macro_rules! to_cow {
-    ($type:ty) => {
         impl<'cow> From<$type> for Cow<'cow, $type> {
             #[inline]
             fn from(obj: $type) -> Cow<'cow, $type> {
@@ -28,9 +30,8 @@ macro_rules! to_cow {
             fn from(obj: &'cow $type) -> Cow<'cow, $type> {
                 Cow::Borrowed(obj)
             }
-        }
+        } )+
     }
 }
 
-to_cow!(ClientInfo);
-to_cow!(RawMsg);
\ No newline at end of file
+to_message!(ClientInfo, RawMsg, EmptyMsg);
\ No newline at end of file
diff --git a/lib/u_lib/src/errors.rs b/lib/u_lib/src/errors.rs
index e38e167..8d4a65c 100644
--- a/lib/u_lib/src/errors.rs
+++ b/lib/u_lib/src/errors.rs
@@ -1,27 +1,87 @@
 use std::fmt;
+use std::error::Error as StdError;
+use reqwest::Error as ReqError;
 use serde::{
     Serialize,
     Deserialize
 };
 
-#[derive(Serialize, Deserialize, Clone)]
-pub enum UError {
+pub type BoxError = Box<(dyn StdError + Send + Sync + 'static)>;
+pub type UResult<T> = std::result::Result<T, UError>;
+
+#[derive(Serialize, Deserialize, Clone, Debug)]
+pub enum UErrType {
+    ConnectionError,
+    ParseError,
+    JobError,
+    Unknown,
     Raw(String)
 }
 
+#[derive(Serialize, Deserialize, Clone, Debug)]
+struct Inner {
+    err_type: UErrType,
+    source: Option<BoxError>
+}
+
+#[derive(Serialize, Deserialize, Clone)]
+pub struct UError {
+    inner: Box<Inner>
+}
+
 impl UError {
-    pub fn description(&self) -> String {
-        match self {
-            UError::Raw(msg) => msg.clone()
+    pub fn new<E: Into<BoxError>>(err_type: UErrType, source: Option<E>) -> Self {
+        Self {
+            inner: Box::new(Inner {
+                source: source.map(Into::into),
+                err_type
+            })
         }
     }
 }
 
 impl fmt::Debug for UError {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        let msg = match self {
-            UError::Raw(msg) => msg
+        let mut builder = f.debug_struct("errors::UError");
+
+        builder.field("kind", &self.inner.err_type);
+
+        if let Some(ref source) = self.inner.source {
+            builder.field("source", source);
+        }
+
+        builder.finish()
+    }
+}
+
+impl fmt::Display for UError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        let e_type = match self.inner.err_type {
+            UErrType::Raw(ref msg) => msg,
+            UErrType::ConnectionError => "Connection error",
+            UErrType::ParseError => "Parse error",
+            UErrType::JobError => "Job error",
+            UErrType::Unknown => "Unknown error",
+        };
+        f.write_str(e_type)?;
+
+        if let Some(ref e) = self.inner.source {
+            write!(f, ": {}", e)
+        } else {
+            Ok(())
+        }
+    }
+}
+
+impl From<ReqError> for UError {
+    fn from(e: ReqError) -> Self {
+        let err_type = if e.is_request() {
+            UErrType::ConnectionError
+        } else if e.is_decode() {
+            UErrType::ParseError
+        } else {
+            UErrType::Unknown
         };
-        write!(f, "{}", msg)
+        UError::new(err_type, Some(e))
     }
 }
\ No newline at end of file
diff --git a/lib/u_lib/src/utils.rs b/lib/u_lib/src/utils.rs
index c3e2352..b344dd7 100644
--- a/lib/u_lib/src/utils.rs
+++ b/lib/u_lib/src/utils.rs
@@ -45,6 +45,11 @@ pub fn setsig(sig: Signal, hnd: SigHandler) {
         signal(sig, hnd).unwrap();
     }
 }
+
+pub fn vec_to_string(v: &Vec<u8>) -> String {
+    String::from_utf8_lossy(v).to_string()
+}
+
 /*
 pub fn generate_auth_token() -> String {