eubnara opened a new pull request, #5259:
URL: https://github.com/apache/hadoop/pull/5259
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### Description of PR
After [HADOOP-16314](https://issues.apache.org/jira/browse/HADOOP-16314),
WebServlet.java was added. On WebServlet#doGet, it redirects '/' to
'/index.html'. However, if a client connects to DataNode with https scheme, it
fails to connect because it responds 302 with Location header which has http
scheme.
(Hostname is modified.)
```
$ curl https://dn1.example.com:50475/ -v 2>&1 | grep Location
< Location: http://dn1.example.com:50475/index.html
```
I can't ensure that which solution is the best between:
- Use DefaultServlet instead of WebServlet. DataNode can answer with
index.html when accessed in '/'.
- According to "dfs.http.policy" in hdfs-site.xml, run internal infoserver
as https or http server each.
### How was this patch tested?
Manually tested with internal cluster.
### For code changes:
- [x] Does the title or this PR starts with the corresponding JIRA issue id
(e.g. 'HADOOP-17799. Your PR title ...')?
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