diff --git a/src/bin_signer/handler.ml b/src/bin_signer/handler.ml
index 1f0849591..e953a1242 100644
--- a/src/bin_signer/handler.ml
+++ b/src/bin_signer/handler.ml
@@ -59,7 +59,17 @@ let sign
 let public_key (cctxt : #Client_context.wallet) pkh =
   log "Request for public key %a"
     Signature.Public_key_hash.pp pkh >>= fun () ->
-  Client_keys.get_public_key cctxt pkh >>=? fun (name, pk) ->
-  log "Found public key for hash %a (name: %s)"
-    Signature.Public_key_hash.pp pkh name >>= fun () ->
-  return pk
+  Client_keys.list_keys cctxt >>=? fun all_keys ->
+  match List.find (fun (_, h, _, _) -> Signature.Public_key_hash.equal h pkh) all_keys with
+  | exception Not_found ->
+      log "No public key found for hash %a"
+        Signature.Public_key_hash.pp pkh >>= fun () ->
+      Lwt.fail Not_found
+  | (_, _, None, _) ->
+      log "No public key found for hash %a"
+        Signature.Public_key_hash.pp pkh >>= fun () ->
+      Lwt.fail Not_found
+  | (name, _, Some pk, _) ->
+      log "Found public key for hash %a (name: %s)"
+        Signature.Public_key_hash.pp pkh name >>= fun () ->
+      return pk
diff --git a/src/bin_signer/http_daemon.ml b/src/bin_signer/http_daemon.ml
new file mode 100644
index 000000000..09ca54d4d
--- /dev/null
+++ b/src/bin_signer/http_daemon.ml
@@ -0,0 +1,66 @@
+(**************************************************************************)
+(*                                                                        *)
+(*    Copyright (c) 2014 - 2018.                                          *)
+(*    Dynamic Ledger Solutions, Inc. <contact@tezos.com>                  *)
+(*                                                                        *)
+(*    All rights reserved. No warranty, explicit or implicit, provided.   *)
+(*                                                                        *)
+(**************************************************************************)
+
+let log = Signer_logging.lwt_log_notice
+
+let run (cctxt : #Client_context.wallet) ~hosts ?magic_bytes ~require_auth mode =
+  let dir = RPC_directory.empty in
+  let dir =
+    RPC_directory.register1 dir Signer_services.sign begin fun pkh signature data ->
+      Handler.sign cctxt { pkh ; data ; signature } ?magic_bytes ~require_auth
+    end in
+  let dir =
+    RPC_directory.register1 dir Signer_services.public_key begin fun pkh () () ->
+      Handler.public_key cctxt pkh
+    end in
+  let dir =
+    RPC_directory.register0 dir Signer_services.authorized_keys begin fun () () ->
+      if require_auth then
+        return None
+      else
+        Handler.Authorized_key.load cctxt >>=? fun keys ->
+        return (Some (keys |> List.split |> snd |> List.map Signature.Public_key.hash))
+    end in
+  Lwt.catch
+    (fun () ->
+       List.map
+         (fun host ->
+            let host = Ipaddr.V6.to_string host in
+            log "Listening on address %s" host >>= fun () ->
+            RPC_server.launch ~host mode dir
+              ~media_types:Media_type.all_media_types
+            >>= fun _server ->
+            fst (Lwt.wait ()))
+         hosts |> Lwt.choose)
+    (function
+      | Unix.Unix_error(Unix.EADDRINUSE, "bind","") ->
+          failwith "Port already in use."
+      | exn -> Lwt.return (error_exn exn))
+
+let run_https (cctxt : #Client_context.wallet) ~host ~port ~cert ~key ?magic_bytes ~require_auth =
+  Lwt_utils_unix.getaddrinfo ~passive:true ~node:host ~service:(string_of_int port) >>= function
+  | []->
+      failwith "Cannot resolve listening address: %S" host
+  | points ->
+      let hosts = fst (List.split points) in
+      log "Accepting HTTPS requests on port %d" port >>= fun () ->
+      let mode : Conduit_lwt_unix.server =
+        `TLS (`Crt_file_path cert, `Key_file_path key, `No_password, `Port port) in
+      run (cctxt : #Client_context.wallet) ~hosts ?magic_bytes ~require_auth mode
+
+let run_http (cctxt : #Client_context.wallet) ~host ~port ?magic_bytes ~require_auth =
+  Lwt_utils_unix.getaddrinfo ~passive:true ~node:host ~service:(string_of_int port) >>= function
+  | [] ->
+      failwith "Cannot resolve listening address: %S" host
+  | points ->
+      let hosts = fst (List.split points) in
+      log "Accepting HTTP requests on port %d" port >>= fun () ->
+      let mode : Conduit_lwt_unix.server =
+        `TCP (`Port port) in
+      run (cctxt : #Client_context.wallet) ~hosts ?magic_bytes ~require_auth mode
diff --git a/src/bin_signer/https_daemon.mli b/src/bin_signer/http_daemon.mli
similarity index 82%
rename from src/bin_signer/https_daemon.mli
rename to src/bin_signer/http_daemon.mli
index 436ae30c0..2250f90be 100644
--- a/src/bin_signer/https_daemon.mli
+++ b/src/bin_signer/http_daemon.mli
@@ -7,9 +7,16 @@
 (*                                                                        *)
 (**************************************************************************)
 
-val run:
+val run_https:
   #Client_context.io_wallet ->
   host:string -> port:int -> cert:string -> key:string ->
   ?magic_bytes: int list ->
   require_auth: bool ->
   'a tzresult Lwt.t
+
+val run_http:
+  #Client_context.io_wallet ->
+  host:string -> port:int ->
+  ?magic_bytes: int list ->
+  require_auth: bool ->
+  'a tzresult Lwt.t
diff --git a/src/bin_signer/https_daemon.ml b/src/bin_signer/https_daemon.ml
deleted file mode 100644
index 6e40562eb..000000000
--- a/src/bin_signer/https_daemon.ml
+++ /dev/null
@@ -1,44 +0,0 @@
-(**************************************************************************)
-(*                                                                        *)
-(*    Copyright (c) 2014 - 2018.                                          *)
-(*    Dynamic Ledger Solutions, Inc. <contact@tezos.com>                  *)
-(*                                                                        *)
-(*    All rights reserved. No warranty, explicit or implicit, provided.   *)
-(*                                                                        *)
-(**************************************************************************)
-
-let log = Signer_logging.lwt_log_notice
-
-let run (cctxt : #Client_context.wallet) ~host ~port ~cert ~key ?magic_bytes ~require_auth =
-  log "Accepting HTTPS requests on port %d" port >>= fun () ->
-  let mode : Conduit_lwt_unix.server =
-    `TLS (`Crt_file_path cert, `Key_file_path key, `No_password, `Port port) in
-  let dir = RPC_directory.empty in
-  let dir =
-    RPC_directory.register1 dir Signer_services.sign begin fun pkh signature data ->
-      Handler.sign cctxt { pkh ; data ; signature } ?magic_bytes ~require_auth
-    end in
-  let dir =
-    RPC_directory.register1 dir Signer_services.public_key begin fun pkh () () ->
-      Handler.public_key cctxt pkh
-    end in
-  let dir =
-    RPC_directory.register0 dir Signer_services.authorized_keys begin fun () () ->
-      if require_auth then
-        return None
-      else
-        Handler.Authorized_key.load cctxt >>=? fun keys ->
-        return (Some (keys |> List.split |> snd |> List.map Signature.Public_key.hash))
-    end in
-  Lwt.catch
-    (fun () ->
-       RPC_server.launch ~host mode dir
-         ~media_types:Media_type.all_media_types
-         ~cors: { allowed_origins = [ "*" ] ;
-                  allowed_headers = [ "Content-Type" ] }
-       >>= fun _server ->
-       fst (Lwt.wait ()))
-    (function
-      | Unix.Unix_error(Unix.EADDRINUSE, "bind","") ->
-          failwith "Port already in use."
-      | exn -> Lwt.return (error_exn exn))
diff --git a/src/bin_signer/main_signer.ml b/src/bin_signer/main_signer.ml
index 6fc1ca829..98503400c 100644
--- a/src/bin_signer/main_signer.ml
+++ b/src/bin_signer/main_signer.ml
@@ -32,6 +32,16 @@ let default_https_port =
   | None -> "443"
   | Some port -> port
 
+let default_http_host =
+  match Sys.getenv_opt "TEZOS_SIGNER_HTTP_HOST" with
+  | None -> "localhost"
+  | Some host -> host
+
+let default_http_port =
+  match Sys.getenv_opt "TEZOS_SIGNER_HTTP_PORT" with
+  | None -> "6732"
+  | Some port -> port
+
 open Clic
 
 let group =
@@ -98,6 +108,31 @@ let commands base_dir require_auth =
       (fun (magic_bytes, path) cctxt ->
          Tezos_signer_backends.Encrypted.decrypt_all cctxt >>=? fun () ->
          Socket_daemon.run cctxt (Unix path) ?magic_bytes ~require_auth) ;
+    command ~group
+      ~desc: "Launch a signer daemon over HTTP."
+      (args3
+         magic_bytes_arg
+         (default_arg
+            ~doc: "listening address or host name"
+            ~short: 'a'
+            ~long: "address"
+            ~placeholder: "host|address"
+            ~default: default_http_host
+            (parameter (fun _ s -> return s)))
+         (default_arg
+            ~doc: "listening HTTP port"
+            ~short: 'p'
+            ~long: "port"
+            ~placeholder: "port number"
+            ~default: default_http_port
+            (parameter
+               (fun _ x ->
+                  try return (int_of_string x)
+                  with Failure _ -> failwith "Invalid port %s" x))))
+      (prefixes [ "launch" ; "http" ; "signer" ] @@ stop)
+      (fun (magic_bytes, host, port) cctxt ->
+         Tezos_signer_backends.Encrypted.decrypt_all cctxt >>=? fun () ->
+         Http_daemon.run_http cctxt ~host ~port ?magic_bytes ~require_auth) ;
     command ~group
       ~desc: "Launch a signer daemon over HTTPS."
       (args3
@@ -123,14 +158,22 @@ let commands base_dir require_auth =
        param
          ~name:"cert"
          ~desc: "path to th TLS certificate"
-         (parameter (fun _ s -> return s)) @@
+         (parameter (fun _ s ->
+              if not (Sys.file_exists s) then
+                failwith "No such TLS certificate file %s" s
+              else
+                return s)) @@
        param
          ~name:"key"
          ~desc: "path to th TLS key"
-         (parameter (fun _ s -> return s)) @@ stop)
+         (parameter (fun _ s ->
+              if not (Sys.file_exists s) then
+                failwith "No such TLS key file %s" s
+              else
+                return s)) @@ stop)
       (fun (magic_bytes, host, port) cert key cctxt ->
          Tezos_signer_backends.Encrypted.decrypt_all cctxt >>=? fun () ->
-         Https_daemon.run cctxt ~host ~port ~cert ~key ?magic_bytes ~require_auth) ;
+         Http_daemon.run_https cctxt ~host ~port ~cert ~key ?magic_bytes ~require_auth) ;
     command ~group
       ~desc: "Authorize a given public key to perform signing requests."
       (args1
diff --git a/src/lib_client_base/client_keys.ml b/src/lib_client_base/client_keys.ml
index 2768a8498..364c72fe8 100644
--- a/src/lib_client_base/client_keys.ml
+++ b/src/lib_client_base/client_keys.ml
@@ -193,13 +193,13 @@ let raw_get_key (cctxt : #Client_context.wallet) pkh =
 let get_key cctxt pkh =
   raw_get_key cctxt pkh >>=? function
   | (pkh, Some pk, Some sk) -> return (pkh, pk, sk)
-  | (_pkh, _pk, None) -> failwith "... FIXME ... E"
-  | (_pkh, None, _sk) -> failwith "... FIXME ... F"
+  | (_pkh, _pk, None) -> failwith "Unknown secret key for %a" Signature.Public_key_hash.pp pkh
+  | (_pkh, None, _sk) -> failwith "Unknown public key for %a" Signature.Public_key_hash.pp pkh
 
 let get_public_key cctxt pkh =
   raw_get_key cctxt pkh >>=? function
   | (pkh, Some pk, _sk) -> return (pkh, pk)
-  | (_pkh, None, _sk) -> failwith "... FIXME ... G"
+  | (_pkh, None, _sk) -> failwith "Unknown public key for %a" Signature.Public_key_hash.pp pkh
 
 let get_keys (cctxt : #Client_context.wallet) =
   Secret_key.load cctxt >>=? fun sks ->
diff --git a/src/lib_client_base_unix/client_main_run.ml b/src/lib_client_base_unix/client_main_run.ml
index 2c8d2a2e2..eefe33104 100644
--- a/src/lib_client_base_unix/client_main_run.ml
+++ b/src/lib_client_base_unix/client_main_run.ml
@@ -110,7 +110,7 @@ let main select_commands =
         (module Tezos_signer_backends.Encrypted.Make(struct
              let cctxt = (client_config :> Client_context.prompter)
            end)) ;
-      let module Remote_authenticator = struct
+      let module Remote_params = struct
         let authenticate pkhs payload =
           Client_keys.list_keys client_config >>=? fun keys ->
           match List.filter_map
@@ -125,17 +125,20 @@ let main select_commands =
           | [] -> failwith
                     "remote signer expects authentication signature, \
                      but no authorized key was found in the wallet"
+        let logger = rpc_config.logger
       end in
-      let module Https = Tezos_signer_backends.Https.Make(Remote_authenticator) in
-      let module Socket = Tezos_signer_backends.Socket.Make(Remote_authenticator) in
+      let module Https = Tezos_signer_backends.Https.Make(Remote_params) in
+      let module Http = Tezos_signer_backends.Http.Make(Remote_params) in
+      let module Socket = Tezos_signer_backends.Socket.Make(Remote_params) in
       Client_keys.register_signer (module Https) ;
+      Client_keys.register_signer (module Http) ;
       Client_keys.register_signer (module Socket.Unix) ;
       Client_keys.register_signer (module Socket.Tcp) ;
       Option.iter parsed_config_file.remote_signer ~f: begin fun signer ->
         Client_keys.register_signer
           (module Tezos_signer_backends.Remote.Make(struct
                let default = signer
-               include Remote_authenticator
+               include Remote_params
              end))
       end ;
       select_commands ctxt parsed_args >>=? fun commands ->
diff --git a/src/lib_signer_backends/encrypted.ml b/src/lib_signer_backends/encrypted.ml
index 3ba295189..24583881f 100644
--- a/src/lib_signer_backends/encrypted.ml
+++ b/src/lib_signer_backends/encrypted.ml
@@ -41,7 +41,7 @@ module Raw = struct
     | None -> return None
     | Some bytes ->
         match Data_encoding.Binary.of_bytes Signature.Secret_key.encoding bytes with
-        | None -> failwith "... FIXME ... D" (* corrupted data *)
+        | None -> failwith "Corrupted wallet, deciphered key is invalid"
         | Some sk -> return (Some sk)
 
 end
@@ -77,7 +77,7 @@ let rec noninteractice_decrypt_loop ~encrypted_sk = function
 
 let decrypt_payload cctxt ?name encrypted_sk =
   match Base58.safe_decode encrypted_sk with
-  | None -> failwith "... FIXME ... A"
+  | None -> failwith "Not a Base58 encoded encrypted key"
   | Some encrypted_sk ->
       let encrypted_sk = MBytes.of_string encrypted_sk in
       noninteractice_decrypt_loop ~encrypted_sk !passwords >>=? function
diff --git a/src/lib_signer_backends/http.ml b/src/lib_signer_backends/http.ml
new file mode 100644
index 000000000..13903789c
--- /dev/null
+++ b/src/lib_signer_backends/http.ml
@@ -0,0 +1,10 @@
+(**************************************************************************)
+(*                                                                        *)
+(*    Copyright (c) 2014 - 2018.                                          *)
+(*    Dynamic Ledger Solutions, Inc. <contact@tezos.com>                  *)
+(*                                                                        *)
+(*    All rights reserved. No warranty, explicit or implicit, provided.   *)
+(*                                                                        *)
+(**************************************************************************)
+
+include Http_gen.Make(struct let scheme = "http" end)
diff --git a/src/lib_signer_backends/http.mli b/src/lib_signer_backends/http.mli
new file mode 100644
index 000000000..fb77b83e5
--- /dev/null
+++ b/src/lib_signer_backends/http.mli
@@ -0,0 +1,16 @@
+(**************************************************************************)
+(*                                                                        *)
+(*    Copyright (c) 2014 - 2018.                                          *)
+(*    Dynamic Ledger Solutions, Inc. <contact@tezos.com>                  *)
+(*                                                                        *)
+(*    All rights reserved. No warranty, explicit or implicit, provided.   *)
+(*                                                                        *)
+(**************************************************************************)
+
+module Make(P : sig
+    val authenticate: Signature.Public_key_hash.t list -> MBytes.t -> Signature.t tzresult Lwt.t
+    val logger: RPC_client.logger
+  end)
+  : Client_keys.SIGNER
+
+val make_base: string -> int -> Uri.t
diff --git a/src/lib_signer_backends/http_gen.ml b/src/lib_signer_backends/http_gen.ml
new file mode 100644
index 000000000..d5f1738ae
--- /dev/null
+++ b/src/lib_signer_backends/http_gen.ml
@@ -0,0 +1,91 @@
+(**************************************************************************)
+(*                                                                        *)
+(*    Copyright (c) 2014 - 2018.                                          *)
+(*    Dynamic Ledger Solutions, Inc. <contact@tezos.com>                  *)
+(*                                                                        *)
+(*    All rights reserved. No warranty, explicit or implicit, provided.   *)
+(*                                                                        *)
+(**************************************************************************)
+
+module Make(N : sig val scheme : string end) = struct
+
+  open Client_keys
+
+  let scheme = N.scheme
+
+  module Make(P : sig
+      val authenticate: Signature.Public_key_hash.t list -> MBytes.t -> Signature.t tzresult Lwt.t
+      val logger: RPC_client.logger
+    end) = struct
+
+    let scheme = scheme
+
+    let title =
+      "Built-in tezos-signer using remote signer through hardcoded " ^ scheme ^ " requests."
+
+    let description =
+      "Valid locators are of this form:\n"
+      ^ " - " ^ scheme ^ "://host/tz1...\n"
+      ^ " - " ^ scheme ^ "://host:port/path/to/service/tz1..."
+
+    let parse uri =
+      (* extract `tz1..` from the last component of the path *)
+      assert (Uri.scheme uri = Some scheme) ;
+      let path = Uri.path uri in
+      begin match String.rindex_opt path '/' with
+        | None ->
+            failwith "Invalid locator %a" Uri.pp_hum uri
+        | Some i ->
+            let pkh = String.sub path (i + 1) (String.length path - i - 1) in
+            let path = String.sub path 0 i in
+            return (Uri.with_path uri path, pkh)
+      end >>=? fun (base, pkh) ->
+      Lwt.return (Signature.Public_key_hash.of_b58check pkh) >>=? fun pkh ->
+      return (base, pkh)
+
+    let public_key uri =
+      parse (uri : pk_uri :> Uri.t) >>=? fun (base, pkh) ->
+      RPC_client.call_service
+        ~logger: P.logger
+        Media_type.all_media_types
+        ~base Signer_services.public_key ((), pkh) () ()
+
+    let neuterize uri =
+      return (Client_keys.make_pk_uri (uri : sk_uri :> Uri.t))
+
+    let public_key_hash uri =
+      public_key uri >>=? fun pk ->
+      return (Signature.Public_key.hash pk)
+
+    let sign ?watermark uri msg =
+      parse (uri : sk_uri :> Uri.t) >>=? fun (base, pkh) ->
+      let msg =
+        match watermark with
+        | None -> msg
+        | Some watermark ->
+            MBytes.concat "" [ Signature.bytes_of_watermark watermark ; msg ] in
+      RPC_client.call_service
+        ~logger: P.logger
+        Media_type.all_media_types
+        ~base Signer_services.authorized_keys () () () >>=? fun authorized_keys ->
+      begin match authorized_keys with
+        | Some authorized_keys ->
+            P.authenticate
+              authorized_keys
+              (Signer_messages.Sign.Request.to_sign ~pkh ~data:msg) >>=? fun signature ->
+            return (Some signature)
+        | None -> return None
+      end >>=? fun signature ->
+      RPC_client.call_service
+        ~logger: P.logger
+        Media_type.all_media_types
+        ~base Signer_services.sign ((), pkh)
+        signature
+        msg
+
+  end
+
+  let make_base host port =
+    Uri.make ~scheme ~host ~port ()
+
+end
diff --git a/src/lib_signer_backends/http_gen.mli b/src/lib_signer_backends/http_gen.mli
new file mode 100644
index 000000000..dcd5ab06d
--- /dev/null
+++ b/src/lib_signer_backends/http_gen.mli
@@ -0,0 +1,20 @@
+(**************************************************************************)
+(*                                                                        *)
+(*    Copyright (c) 2014 - 2018.                                          *)
+(*    Dynamic Ledger Solutions, Inc. <contact@tezos.com>                  *)
+(*                                                                        *)
+(*    All rights reserved. No warranty, explicit or implicit, provided.   *)
+(*                                                                        *)
+(**************************************************************************)
+
+module Make(N : sig val scheme : string end) : sig
+
+  module Make(P : sig
+      val authenticate: Signature.Public_key_hash.t list -> MBytes.t -> Signature.t tzresult Lwt.t
+      val logger: RPC_client.logger
+    end)
+    : Client_keys.SIGNER
+
+  val make_base: string -> int -> Uri.t
+
+end
diff --git a/src/lib_signer_backends/https.ml b/src/lib_signer_backends/https.ml
index 8ff78ea02..aff203cdd 100644
--- a/src/lib_signer_backends/https.ml
+++ b/src/lib_signer_backends/https.ml
@@ -7,77 +7,4 @@
 (*                                                                        *)
 (**************************************************************************)
 
-open Client_keys
-
-let scheme = "https"
-
-module Make(P : sig
-    val authenticate: Signature.Public_key_hash.t list -> MBytes.t -> Signature.t tzresult Lwt.t
-  end) = struct
-
-  let scheme = scheme
-
-  let title =
-    "Built-in tezos-signer using remote signer through hardcoded https requests."
-
-  let description =
-    "Valid locators are of this form:\n\
-    \ -  https://host/tz1...\n\
-    \ -  https://host:port/path/to/service/tz1...\n"
-
-  let parse uri =
-    (* extract `tz1..` from the last component of the path *)
-    assert (Uri.scheme uri = Some scheme) ;
-    let path = Uri.path uri in
-    begin match String.rindex_opt path '/' with
-      | None ->
-          failwith "Invalid locator %a" Uri.pp_hum uri
-      | Some i ->
-          let pkh = String.sub path (i + 1) (String.length path - i - 1) in
-          let path = String.sub path 0 i in
-          return (Uri.with_path uri path, pkh)
-    end >>=? fun (base, pkh) ->
-    Lwt.return (Signature.Public_key_hash.of_b58check pkh) >>=? fun pkh ->
-    return (base, pkh)
-
-  let public_key uri =
-    parse (uri : pk_uri :> Uri.t) >>=? fun (base, pkh) ->
-    RPC_client.call_service
-      Media_type.all_media_types
-      ~base Signer_services.public_key ((), pkh) () ()
-
-  let neuterize uri =
-    return (Client_keys.make_pk_uri (uri : sk_uri :> Uri.t))
-
-  let public_key_hash uri =
-    public_key uri >>=? fun pk ->
-    return (Signature.Public_key.hash pk)
-
-  let sign ?watermark uri msg =
-    parse (uri : sk_uri :> Uri.t) >>=? fun (base, pkh) ->
-    let msg =
-      match watermark with
-      | None -> msg
-      | Some watermark ->
-          MBytes.concat "" [ Signature.bytes_of_watermark watermark ; msg ] in
-    RPC_client.call_service
-      Media_type.all_media_types
-      ~base Signer_services.authorized_keys () () () >>=? fun authorized_keys ->
-    begin match authorized_keys with
-      | Some authorized_keys ->
-          P.authenticate
-            authorized_keys
-            (Signer_messages.Sign.Request.to_sign ~pkh ~data:msg) >>=? fun signature ->
-          return (Some signature)
-      | None -> return None
-    end >>=? fun signature ->
-    RPC_client.call_service
-      Media_type.all_media_types
-      ~base Signer_services.sign ((), pkh)
-      signature
-      msg
-
-end
-
-let make_base host port =
-  Uri.make ~scheme ~host ~port ()
+include Http_gen.Make(struct let scheme = "https" end)
diff --git a/src/lib_signer_backends/https.mli b/src/lib_signer_backends/https.mli
index 978378073..fb77b83e5 100644
--- a/src/lib_signer_backends/https.mli
+++ b/src/lib_signer_backends/https.mli
@@ -9,6 +9,7 @@
 
 module Make(P : sig
     val authenticate: Signature.Public_key_hash.t list -> MBytes.t -> Signature.t tzresult Lwt.t
+    val logger: RPC_client.logger
   end)
   : Client_keys.SIGNER
 
diff --git a/src/lib_signer_backends/remote.ml b/src/lib_signer_backends/remote.ml
index 7b95fef59..1bc75f9e2 100644
--- a/src/lib_signer_backends/remote.ml
+++ b/src/lib_signer_backends/remote.ml
@@ -14,6 +14,7 @@ let scheme = "remote"
 module Make(S : sig
     val default : Uri.t
     val authenticate: Signature.Public_key_hash.t list -> MBytes.t -> Signature.t tzresult Lwt.t
+    val logger: RPC_client.logger
   end) = struct
 
   let scheme = scheme
@@ -25,18 +26,21 @@ module Make(S : sig
     "Valid locators are of this form: remote://tz1...\n\
      The key will be queried to current remote signer, which can be \
      configured with the `--remote-signer` or `-R` options, \
-     or by defining the following environment variables:\n \
-     - $TEZOS_SIGNER_UNIX_PATH,\n\
-     - $TEZOS_SIGNER_TCP_HOST and $TEZOS_SIGNER_TCP_PORT (default: 7732),\n\
-     - $TEZOS_SIGNER_HTTPS_HOST and $TEZOS_SIGNER_HTTPS_PORT (default: 443)."
+     or by defining the following environment variables:\n\
+    \ - $TEZOS_SIGNER_UNIX_PATH,\n\
+    \ - $TEZOS_SIGNER_TCP_HOST and $TEZOS_SIGNER_TCP_PORT (default: 7732),\n\
+    \ - $TEZOS_SIGNER_HTTP_HOST and $TEZOS_SIGNER_HTTP_PORT (default: 6732),\n\
+    \ - $TEZOS_SIGNER_HTTPS_HOST and $TEZOS_SIGNER_HTTPS_PORT (default: 443)."
 
   module Socket = Socket.Make(S)
+  module Http = Http.Make(S)
   module Https = Https.Make(S)
 
   let get_remote () =
     match Uri.scheme S.default with
     | Some "unix" -> (module Socket.Unix : SIGNER)
     | Some "tcp" -> (module Socket.Tcp : SIGNER)
+    | Some "http" -> (module Http : SIGNER)
     | Some "https" -> (module Https : SIGNER)
     | _ -> assert false
 
@@ -51,7 +55,7 @@ module Make(S : sig
         (fun uri ->
            let key = Uri.path uri in
            Uri.with_path S.default key)
-    | Some "https" ->
+    | Some ("https" | "http") ->
         (fun uri ->
            let key = Uri.path uri in
            match Uri.path S.default with
@@ -89,11 +93,12 @@ let make_pk pk =
 let read_base_uri_from_env () =
   match Sys.getenv_opt "TEZOS_SIGNER_UNIX_PATH",
         Sys.getenv_opt "TEZOS_SIGNER_TCP_HOST",
+        Sys.getenv_opt "TEZOS_SIGNER_HTTP_HOST",
         Sys.getenv_opt "TEZOS_SIGNER_HTTPS_HOST" with
-  | None, None, None -> return None
-  | Some path, None, None ->
+  | None, None, None, None -> return None
+  | Some path, None, None, None ->
       return (Some (Socket.make_unix_base path))
-  | None, Some host, None -> begin
+  | None, Some host, None, None -> begin
       try
         let port =
           match Sys.getenv_opt "TEZOS_SIGNER_TCP_PORT" with
@@ -103,7 +108,17 @@ let read_base_uri_from_env () =
       with Invalid_argument _ ->
         failwith "Failed to parse TEZOS_SIGNER_TCP_PORT.@."
     end
-  | None, None, Some host -> begin
+  | None, None, Some host, None -> begin
+      try
+        let port =
+          match Sys.getenv_opt "TEZOS_SIGNER_HTTP_PORT" with
+          | None -> 6732
+          | Some port -> int_of_string port in
+        return (Some (Http.make_base host port))
+      with Invalid_argument _ ->
+        failwith "Failed to parse TEZOS_SIGNER_HTTP_PORT.@."
+    end
+  | None, None, None, Some host -> begin
       try
         let port =
           match Sys.getenv_opt "TEZOS_SIGNER_HTTPS_PORT" with
@@ -113,11 +128,12 @@ let read_base_uri_from_env () =
       with Invalid_argument _ ->
         failwith "Failed to parse TEZOS_SIGNER_HTTPS_PORT.@."
     end
-  | _, _, _ ->
+  | _, _, _, _ ->
       failwith
         "Only one the following environment variable must be defined: \
          TEZOS_SIGNER_UNIX_PATH, \
          TEZOS_SIGNER_TCP_HOST, \
+         TEZOS_SIGNER_HTTP_HOST, \
          TEZOS_SIGNER_HTTPS_HOST@."
 
 type error += Invalid_remote_signer of string
@@ -130,7 +146,13 @@ let () =
     ~description: "The provided remote signer is invalid."
     ~pp:
       (fun ppf s ->
-         Format.fprintf ppf "Value '%s' is not a valid URI for a remote signer" s)
+         Format.fprintf ppf
+           "@[<v 0>Value '%s' is not a valid URI for a remote signer.@,\
+            Supported URIs for remote signers are of the form:@,\
+           \ - unix:///path/to/socket/file@,\
+           \ - tcp://host:port@,\
+           \ - http://host[:port][/prefix]@,\
+           \ - https://host[:port][/prefix]@]" s)
     Data_encoding.(obj1 (req "uri" string))
     (function Invalid_remote_signer s -> Some s | _ -> None)
     (fun s -> Invalid_remote_signer s)
@@ -140,6 +162,7 @@ let parse_base_uri s =
   try
     let uri = Uri.of_string s in
     match Uri.scheme uri with
+    | Some "http" -> return uri
     | Some "https" -> return uri
     | Some "tcp" -> return uri
     | Some "unix" -> return uri
diff --git a/src/lib_signer_backends/remote.mli b/src/lib_signer_backends/remote.mli
index 251150ed0..338f12655 100644
--- a/src/lib_signer_backends/remote.mli
+++ b/src/lib_signer_backends/remote.mli
@@ -10,6 +10,7 @@
 module Make(S : sig
     val default : Uri.t
     val authenticate: Signature.Public_key_hash.t list -> MBytes.t -> Signature.t tzresult Lwt.t
+    val logger: RPC_client.logger
   end) : Client_keys.SIGNER
 
 val make_pk: Signature.public_key -> Client_keys.pk_uri
diff --git a/src/lib_signer_services/signer_services.ml b/src/lib_signer_services/signer_services.ml
index 8050b35c5..a4c74c24b 100644
--- a/src/lib_signer_services/signer_services.ml
+++ b/src/lib_signer_services/signer_services.ml
@@ -23,14 +23,14 @@ let sign =
     ~query
     ~input: Data_encoding.bytes
     ~output: Data_encoding.(obj1 (req "signature" Signature.encoding))
-    RPC_path.(root /: Signature.Public_key_hash.rpc_arg)
+    RPC_path.(root / "keys" /: Signature.Public_key_hash.rpc_arg)
 
 let public_key =
   RPC_service.get_service
     ~description: "Retrieve the public key of a given remote key"
     ~query: RPC_query.empty
     ~output: Data_encoding.(obj1 (req "public_key" Signature.Public_key.encoding))
-    RPC_path.(root /: Signature.Public_key_hash.rpc_arg)
+    RPC_path.(root / "keys" /: Signature.Public_key_hash.rpc_arg)
 
 let authorized_keys =
   RPC_service.get_service