[WIP] CC-33579 - use connector level proxy configs and make HttpClient keyed on proxy

[sangeet259]

To be added
Ignore the log lines. They are currently for debugging purposes. Will remove them before the final state.

[Copilot]

Pull Request Overview

This PR implements connector-level proxy configuration support and updates the HTTP client caching mechanism to key clients by proxy settings.

• Introduces HttpClientSettingsKey and a concurrent cache in HttpUtil to manage multiple CloseableHttpClient instances based on account and proxy settings.
• Updates Utils.createProperties to preserve case for proxy-related properties and propagates proxyProperties through new constructors in ingestion and streaming classes.
• Adds comprehensive tests in HttpUtilCacheTest to verify HTTP client caching behavior with different proxy scenarios.

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/main/java/net/snowflake/ingest/utils/HttpUtil.java	Use proxy-aware HttpClient cache keyed by HttpClientSettingsKey.
src/main/java/net/snowflake/ingest/utils/Utils.java	Preserve case for proxy-related properties in property normalization.
src/main/java/net/snowflake/ingest/utils/HttpClientSettingsKey.java	New serializable key class for HTTP client settings.
src/main/java/net/snowflake/ingest/streaming/internal/StreamingIngestStage.java	Add constructor overload and propagate proxyProperties.
src/main/java/net/snowflake/ingest/streaming/internal/SnowflakeStreamingIngestClientInternal.java	Store and extract original proxy properties for client creation.
src/main/java/net/snowflake/ingest/streaming/internal/FlushService.java	Pass proxyProperties into StreamingIngestStage.
src/main/java/net/snowflake/ingest/SimpleIngestManager.java	Add constructor and init method support for proxyProperties.
src/test/java/net/snowflake/ingest/utils/HttpUtilCacheTest.java	New tests for HTTP client caching with and without proxy settings.
pom.xml	Update groupId to net.snowflake and version to local snapshot.

Comments suppressed due to low confidence (6)

src/test/java/net/snowflake/ingest/utils/HttpUtilCacheTest.java:20

• Consider clearing system proxy-related properties in tearDown to avoid test flakiness if system properties affect HttpUtil behavior.

@After

src/main/java/net/snowflake/ingest/utils/HttpUtil.java:117

• Remove or replace these System.out.println debug statements with proper logger calls and avoid shipping debug-only prints.

    System.out.println("DEBUGSNOWFLAKEPROXY: From Snowflake Ingest HttpUtil. Getting HTTP client for account: " + accountName);

src/main/java/net/snowflake/ingest/utils/HttpUtil.java:176

• Avoid logging sensitive information such as proxy passwords; these debug prints expose credentials in plain text.

        System.out.println("DEBUGSNOWFLAKEPROXY: From Snowflake Ingest HttpUtil. Proxy Password: " + proxyPassword);

src/main/java/net/snowflake/ingest/utils/Utils.java:144

• [nitpick] Inconsistent indentation in the new isProxyRelatedProperty branch; align braces and statements with surrounding code style conventions.

            properties.put(key, val);

src/main/java/net/snowflake/ingest/streaming/internal/StreamingIngestStage.java:131

• Multiple System.out.println debug statements should be removed or converted to logger.debug to follow logging best practices.

    System.out.println("DEBUGSNOWFLAKEPROXY: StreamingIngestStage constructor - final proxyProperties contains " + this.proxyProperties.size() + " properties:");

src/main/java/net/snowflake/ingest/streaming/internal/SnowflakeStreamingIngestClientInternal.java:178

• Remove or replace these System.out.println debug statements with appropriate logging; avoid excessive debug output in production code.

    System.out.println("DEBUGSNOWFLAKEPROXY: Properties are not null in SnowflakeStreamingIngestClientInternal");

[sudeshwasnik]

nit -> lets no print password

[sangeet259]

sure. this is all for debugging. will remove.