diff --git a/src/controllers/conversations_controller.rs b/src/controllers/conversations_controller.rs
index 56b707b..e0edd60 100644
--- a/src/controllers/conversations_controller.rs
+++ b/src/controllers/conversations_controller.rs
@@ -55,5 +55,7 @@ pub fn get_list(r: &mut HttpRequestHandler) -> RequestResult {
 
 /// Get information about a single conversation
 pub fn get_single(r: &mut HttpRequestHandler) -> RequestResult {
-    r.success("Implement id")
+    let conversation_id = r.post_conv_id("conversationID")?;
+
+    r.success("do it")
 }
\ No newline at end of file
diff --git a/src/data/http_request_handler.rs b/src/data/http_request_handler.rs
index f70ff85..c7dea90 100644
--- a/src/data/http_request_handler.rs
+++ b/src/data/http_request_handler.rs
@@ -12,7 +12,7 @@ use crate::data::api_client::APIClient;
 use crate::data::config::conf;
 use crate::data::error::{ExecError, ResultBoxError};
 use crate::data::user::UserID;
-use crate::helpers::{account_helper, api_helper, user_helper};
+use crate::helpers::{account_helper, api_helper, user_helper, conversations_helper};
 use crate::utils::virtual_directories_utils::check_virtual_directory;
 
 /// Http request handler
@@ -264,6 +264,10 @@ impl HttpRequestHandler {
         Ok(self.post_string(name)?.parse::<i64>()?)
     }
 
+    pub fn post_u64(&mut self, name: &str) -> ResultBoxError<u64> {
+        Ok(self.post_string(name)?.parse::<u64>()?)
+    }
+
     /// Get a boolean included in a POST request
     pub fn post_bool(&mut self, name: &str) -> ResultBoxError<bool> {
         Ok(self.post_string(name)?.eq("true"))
@@ -343,4 +347,15 @@ impl HttpRequestHandler {
 
         Ok(dir)
     }
+
+    /// Get & return the ID of the conversation included in the POST request
+    pub fn post_conv_id(&mut self, name: &str) -> ResultBoxError<u64> {
+        let conv_id = self.post_u64(name)?;
+
+        if !conversations_helper::does_user_belongs_to(self.user_id()?, conv_id)? {
+            self.forbidden(format!("You do not belong to conversation {} !", conv_id))?;
+        }
+
+        Ok(conv_id)
+    }
 }
\ No newline at end of file
diff --git a/src/helpers/conversations_helper.rs b/src/helpers/conversations_helper.rs
index 8567604..dbd9493 100644
--- a/src/helpers/conversations_helper.rs
+++ b/src/helpers/conversations_helper.rs
@@ -77,7 +77,15 @@ pub fn get_list_members(conv_id: u64) -> ResultBoxError<Vec<UserID>> {
     database::QueryInfo::new(CONV_USERS_TABLE)
         .cond_u64("conv_id", conv_id)
         .add_field("user_id")
-        .exec(|res|res.get_user_id("user_id"))
+        .exec(|res| res.get_user_id("user_id"))
+}
+
+/// Check if a user belongs to a conversation or not
+pub fn does_user_belongs_to(user_id: UserID, conv_id: u64) -> ResultBoxError<bool> {
+    Ok(database::QueryInfo::new(CONV_USERS_TABLE)
+        .cond_u64("conv_id", conv_id)
+        .cond_user_id("user_id", user_id)
+        .exec_count()? > 0)
 }
 
 /// Turn a database entry into a ConversationInfo object