# 5.0.0-alpha5: XPUT Mapping response: "curl: (52) Empty reply from server"
**URL:** https://discuss.elastic.co/t/5-0-0-alpha5-xput-mapping-response-curl-52-empty-reply-from-server/64869
**Category:** Elasticsearch
**Created:** [November 3, 2016, 1:27pm UTC](https://discuss.elastic.co/t/5-0-0-alpha5-xput-mapping-response-curl-52-empty-reply-from-server/64869 "2016-11-03T13:27:50Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Paul\_Ainslie](https://discuss.elastic.co/u/Paul_Ainslie)
#### Post date: [November 3, 2016, 1:27pm UTC](https://discuss.elastic.co/t/5-0-0-alpha5-xput-mapping-response-curl-52-empty-reply-from-server/64869/1 "2016-11-03T13:27:50Z")
Why would I get an "Empty reply from server" when trying to create a mapping? Turned logging up to DEBUG and I'm not seeing anything. All the other curl commands work fine including creating a new index.
We upgraded last week to ES 5.0.0-alpha5. This exact same mapping worked fine in ES 2.4.1.
```
~$ curl -XPUT localhost:9200/mediaserver_v2/_mapping -d @mediaserver_v2_mapping.json -vvv
* Hostname was NOT found in DNS cache
* Trying 127.0.0.1...
* Connected to localhost (127.0.0.1) port 9200 (#0)
> PUT /mediaserver_v2/_mapping HTTP/1.1
> User-Agent: curl/7.38.0
> Host: localhost:9200
> Accept: */*
> Content-Length: 2216
> Content-Type: application/x-www-form-urlencoded
> Expect: 100-continue
>
* Empty reply from server
* Connection #0 to host localhost left intact
curl: (52) Empty reply from server
```
---
### Author:  [@shanec](https://discuss.elastic.co/u/shanec)
#### Post date: [November 4, 2016, 5:43pm UTC](https://discuss.elastic.co/t/5-0-0-alpha5-xput-mapping-response-curl-52-empty-reply-from-server/64869/2 "2016-11-04T17:43:08Z")
Alpha5 had a bug with netty4 + the `Expect: 100-continue` header. See [here](https://github.com/elastic/elasticsearch/issues/19834) for details. You have 2 options:
1. Upgrade to beta1 or later, where the bug was fixed
2. Switch to netty3 by running Elasticsearch with `bin/elasticsearch --E http.type=netty3`
---
### Author:  [@Paul\_Ainslie](https://discuss.elastic.co/u/Paul_Ainslie)
#### Post date: [November 7, 2016, 2:33pm UTC](https://discuss.elastic.co/t/5-0-0-alpha5-xput-mapping-response-curl-52-empty-reply-from-server/64869/3 "2016-11-07T14:33:59Z")
Thanks - upgrading to ES 5.0.0 did the trick!
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 5, 2017, 10:06pm UTC](https://discuss.elastic.co/t/5-0-0-alpha5-xput-mapping-response-curl-52-empty-reply-from-server/64869/4 "2017-07-05T22:06:12Z")