Range request handler did not apply `beforeSend` headers

[jmhmd]

Fixes application of beforeSend headers for range requests, and also fixes serialization error for range requests when the retrieve config chunkSize parameter is a function, not a number.

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PR

• [] My Pull Request title is descriptive, accurate and follows the semantic-release format and guidelines.

Code

• [] My code has been well-documented (function documentation, inline comments, etc.)

Public Documentation Updates

• [] The documentation page has been updated as necessary for any public API additions or removals.

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[jmhmd]

Bumping this for review, still get serialization error on the latest version when using function for chunkSize