Add support for HTTP headers on builders

elastic / elasticsearch-rs

Official Elasticsearch Rust Client

Apache License 2.0

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Closed russcam closed 4 years ago

russcam commented 4 years ago

This PR adds the ability to set custom HTTP headers on a builder struct to be included in the API request.

Add X_OPAQUE_ID static &str value for the X-Opaque-Id HTTP header value

Closes #16