[MINDEXER-166] Add UrlResource with retry logic?

**[Stephen Buergler](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=sixcorners)** opened **[MINDEXER-166](https://issues.apache.org/jira/browse/MINDEXER-166?redirect=false)** and commented

If the connection breaks in the middle of downloading the index or an update to the index it would be nice if the connection could just be retried. Currently it seems like the way to handle it is to revert the changes made while processing what i have so far or replay everything from the beginning or just replay things if I don't care about getting every change.

Going to make a pull request with what I use but it's not exactly fit to be merged as is.

---

**Remote Links:**
- [GitHub Pull Request #232
](https://github.com/apache/maven-indexer/pull/232)

Start with the MINDEXER-166 description and the proposed UrlResource work, then review the linked pull request #232 to understand the existing approach. Check how interrupted index downloads or updates are currently handled. Done should provide retry behavior for broken connections without requiring a full replay or manual rollback.

Written by the indexing model from the issue text.