[Bug]: RUM client ignores PORT number in the endpoint config

[sandeeppoonia]

Which web client version did you detect this bug with?

v1.13.3

What environment (build systems, module system, and framework) did you detect this bug with?

TypeScript v5.3.3, ECMAScript modules (ESM) and React v18.2.0

Is your web application a single page application (SPA) or multi page application (MPA)?

SPA

Please provide your web client configuration

{
sessionSampleRate: 1,
signing: false,
endpoint: ${window.location.origin}/api,
telemetries: ["errors", "performance", "http"],
allowCookies: true
}

Please describe the bug/issue

If we use a proxy for run endpoint, instead of directly going to actual RUM endpoint, and tries to run the webapp locally ( e.g. on http://localhost:4000/ ) the rum client makes requests to http://localhost/api/monitors/ instead of http://localhost:4000/api/monitors/ .

[sandeeppoonia]

The root cause is : in DataPlaneClient where while creating the options the port is not set. So when fetch request is made, the port is not set.