Fix request request path to always include leading slash /

[schlosna]

Before this PR

#2437 introduced an issue where requests with an empty path were no longer rendered with a leading slash.

prior to 4.6.0 render URLs like:
https://localhost:59845/?REQUEST=GetCapabilities&SERVICE=WMS

4.6.0 renders them like:
https://localhost:59845?REQUEST=GetCapabilities&SERVICE=WMS

Specifically see org.apache.hc.core5.http.support.AbstractRequestBuilder#setUri(java.net.URI)

After this PR

==COMMIT_MSG==
Fix request request path to always include leading slash /
==COMMIT_MSG==

Possible downsides?

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• feature: A new feature of the service.
• improvement: An incremental improvement in the functionality or operation of the service.
• fix: Remedies the incorrect behaviour of a component of the service in a backwards-compatible way.
• break: Has the potential to break consumers of this service's API, inclusive of both Palantir services
  and external consumers of the service's API (e.g. customer-written software or integrations).
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  operation of the service itself.
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  performing database surgery, ...) at the time of upgrade for it to succeed.
• migration: A fully automatic upgrade migration task with no engineer input required.

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• ❗The break and manual task changelog types will result in a major release!
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Type

• Feature
• Improvement
• Fix
• Break
• Deprecation
• Manual task
• Migration

Description

Fix request request path to always include leading slash /

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[autorelease3]

Released 4.7.0