diff --git a/src/data/http_request_handler.rs b/src/data/http_request_handler.rs
index 646f685..2564f62 100644
--- a/src/data/http_request_handler.rs
+++ b/src/data/http_request_handler.rs
@@ -1,10 +1,9 @@
 use actix_web::{web, HttpRequest, HttpResponse};
 use crate::controllers::routes::RequestResult;
 use crate::data::http_error::HttpError;
-use std::convert::TryFrom;
 use std::error::Error;
 use serde::Serialize;
-use crate::data::error::{ResultBoxError};
+use crate::data::error::{ResultBoxError, ExecError};
 use std::collections::HashMap;
 
 /// Http request handler
@@ -73,14 +72,14 @@ impl HttpRequestHandler {
     pub fn internal_error(&mut self, error: Box<dyn Error>) -> RequestResult {
         self.response = Some(HttpResponse::InternalServerError().json(
             HttpError::internal_error("Internal server error.")));
-        Err(Box::try_from(actix_web::error::ErrorInternalServerError(error)).unwrap())
+        Err(error)
     }
 
     /// Bad request
     pub fn bad_request(&mut self, message: String) -> RequestResult {
         self.response = Some(HttpResponse::BadRequest().json(
             HttpError::bad_request(&message)));
-        Err(Box::try_from(actix_web::error::ErrorBadRequest(message)).unwrap())
+        Err(Box::new(ExecError::new(&message)))
     }
 
     /// Get the path of the request
@@ -110,12 +109,14 @@ impl HttpRequestHandler {
     }
 
     /// Get a post string
-    pub fn post_string(&mut self, name: &str) -> Result<String, Box<dyn Error>> {
+    pub fn post_string(&mut self, name: &str) -> ResultBoxError<String> {
         let param = self.post_parameter(name)?;
 
         match &param.string {
-            None => Err(Box::new(actix_web::error::ErrorBadRequest(format!("{} is not a string!", name)))),
-            Some(s) => Ok(s.to_string())
+            Some(s) => Ok(s.to_string()),
+            None => {
+                Err(self.bad_request(format!("'{}' is not a string!", name)).unwrap_err())
+            },
         }
     }
 }
\ No newline at end of file