[jira] [Created] (MESOS-9652) URL handler lookup might miss root handlers

["Benno Evers (JIRA)" <ji...@apache.org>]

Benno Evers created MESOS-9652:
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             Summary: URL handler lookup might miss root handlers
                 Key: MESOS-9652
                 URL: https://issues.apache.org/jira/browse/MESOS-9652
             Project: Mesos
          Issue Type: Bug
            Reporter: Benno Evers


When looking up url handlers, libprocess is looking for the longest URL prefix that corresponds to a http endpoint handler registered by the handling process.

For example if a process did setup route `/foo` and `/foo/bar`, an incoming http request for `/foo/bar/baz` would be dispatched onto the `/foo/bar` handler.

However, if a process registers a route `/` the lookup will only succeed if the request is exactly for `/`, and a request for `/baz` will return a 404 Not Found response.

The root cause of this is the implementation of the handler lookup:
{noformat}
// ProcessBase::consume(HttpEvent&&)
name = strings::trim(name, strings::PREFIX, "/");
[...]
while (Path(name, '/').dirname() != name) {
  [...]
}
{noformat}

where `dirname()` returns "." when given an input string that does not contain any `/` as `name`.



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