request.pipe_unspecified

No pipe is selected


Type	`https://mthds.ai/errors/request.pipe_unspecified`
Family	`request`: The HTTP request itself, before any run.
Domain	`input`: the caller acts, by changing the request or its inputs
Retry	`no`: repeating the operation fails the same way
HTTP status	`422`
Raised as	a problem document, sent as the body of an HTTP response or kept in a run's record

What it means

The request names no pipe_code, and the method gives no main_pipe to start from: its manifest declares none or, with no manifest, its bundles declare none or several.

What to do

Send a pipe_code naming one of params.candidates. The method's author can instead declare a main_pipe, so that a request without pipe_code starts there.

Next steps

A problem carries the step aimed at whoever reads it: the first when its reader is the domain's actor, the caller, and the second for any other reader.

Reader	Kind	Detail
The domain's actor	`change_input`	Select a pipe with pipe_code, then send the request again.
Any other reader	`change_input`	Pass this to the caller, who must select a pipe with pipe_code.

Detail

The problem's detail is written from this template, filled with the occurrence's parameters:

The request selects no pipe, and the method gives no main pipe to start from.

Parameters

Every parameter is present on every occurrence of the code.

Name	Type	Description
`candidates`	list of `identifier`	The pipes the request could select.