Add HttpDisconnectError to avoid client processor notification call.

chronos/apps/http/httpcommon.nim

@@ -25,6 +25,7 @@ type
     code*: HttpCode
   HttpRecoverableError* = object of HttpError
     code*: HttpCode
+  HttpDisconnectError* = object of HttpError
 
   TransferEncodingFlags* {.pure.} = enum
     Identity, Chunked, Compress, Deflate, Gzip
@@ -80,6 +81,11 @@ proc newHttpRecoverableError*(msg: string,
   tre.code = code
   tre
 
+proc newHttpDisconnectError*(): ref HttpDisconnectError {.
+     raises: [HttpDisconnectError].} =
+  var tre = newException(HttpDisconnectError, "Remote peer disconnected")
+  tre
+
 iterator queryParams*(query: string): tuple[key: string, value: string] {.
          raises: [Defect].} =
   ## Iterate over url-encoded query string.

chronos/apps/http/httpserver.nim

@@ -429,10 +429,8 @@ proc getRequest(conn: HttpConnectionRef): Future[HttpRequestRef] {.async.} =
         raise newHttpCriticalError("Invalid request received", res.error)
       else:
         return res.get()
-  except AsyncStreamIncompleteError:
+  except AsyncStreamIncompleteError, AsyncStreamReadError:
-    raise newHttpCriticalError("Remote peer disconnected")
+    raise newHttpDisconnectError()
-  except AsyncStreamReadError:
-    raise newHttpCriticalError("Connection with remote peer has been lost")
   except AsyncStreamLimitError:
     raise newHttpCriticalError("Maximum size of request headers reached",
                                Http413)
@@ -561,6 +559,9 @@ proc processLoop(server: HttpServerRef, transp: StreamTransport) {.async.} =
       let error = HttpProcessError.init(HTTPServerError.CriticalError, exc,
                                         transp.remoteAddress(), exc.code)
       arg = RequestFence[HttpRequestRef].err(error)
+    except HttpDisconnectError:
+      # If remote peer disconnected we just exiting loop
+      breakLoop = true
     except CatchableError as exc:
       let error = HttpProcessError.init(HTTPServerError.CatchableError, exc,
                                         transp.remoteAddress(), Http500)