Update to Apache HttpClient 5.

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First steps

1. Read the whole issue, then the project's contributing guide.
2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
3. Fork the repository and make your change on a branch.
4. Open a pull request that references the issue number.

More from googleapis/google-http-java-client

• Core: Validate header names and values to prevent CRLF injection

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  Difficulty 2/5 1-3 hours Newbie friendliness 78/100

  googleapis/google-http-java-client#2180 · Opened Jul 30, 2026

• Core: XmlPullParser processes external DTD entities (XXE) — disable FEATURE_PROCESS_DOCDECL in Xml#createParser()

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  Difficulty 2/5 1-3 hours Newbie friendliness 84/100

  googleapis/google-http-java-client#2179 · Opened Jul 30, 2026

• Core: LowLevelHttpResponse not disconnected when HttpResponse construction throws RuntimeException

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  Difficulty 2/5 1-3 hours Newbie friendliness 84/100

  googleapis/google-http-java-client#2177 · Opened Jul 30, 2026

• GZipEncoding should throw IOException from close

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  type: cleanup

  Difficulty 2/5 1-3 hours Newbie friendliness 68/100

  googleapis/google-http-java-client#868 · Opened Oct 31, 2019

• org.apache.http.conn.ssl.SSLSocketFactory is deprecated

  May be free again A pull request for this issue was closed without being merged. Open

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  priority: p2 type: cleanup

  Difficulty 2/5 1-3 hours Newbie friendliness 65/100

  googleapis/google-http-java-client#778 · Opened Aug 8, 2019

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