public Map<HttpHost, AuthExchange> getAuthExchanges() {
        if (authExchangeMap == null) {
            authExchangeMap = new HashMap<>();
        }
        return authExchangeMap;
    }
Represents a map of {@link AuthExchange}s performed in the context of the request
execution.
<p>
This context attribute is expected to be populated by the protocol handler.

@since 5.0
httpclient5/src/main/java/org/apache/hc/client5/http/protocol/HttpClientContext.java