Github user nickva commented on the issue:
https://github.com/apache/couchdb-chttpd/pull/151
+1
```
In [15]: fun2 = '''function(doc, req){ return [doc, {headers:
...: {'Content-Type': 'text/blah'}
...:
...: , 'body': '<h1>test</h1>'}]}'''
In [16]: doc2 = {"updates": {"doc":fun2}}
In [17]: d['_design/dump2'] = doc2
```
then saw custom header and NewRev
```
curl -v -X PUT http://localhost:15984/d/_design/dump2/_update/doc/foo
* Trying ::1...
* connect to ::1 port 15984 failed: Connection refused
* Trying 127.0.0.1...
* Connected to localhost (127.0.0.1) port 15984 (#0)
> PUT /d/_design/dump2/_update/doc/foo HTTP/1.1
> Host: localhost:15984
> User-Agent: curl/7.43.0
> Accept: */*
>
< HTTP/1.1 201 Created
< Content-Length: 13
< Content-Type: text/blah
< Date: Thu, 01 Dec 2016 15:46:30 GMT
< Server: CouchDB/2.0.0-d9b51a0 (Erlang OTP/18)
< X-Couch-Id: foo
< X-Couch-Request-ID: 549d61e9e7
< X-Couch-Update-NewRev: 3-825cb35de44c433bfb2df415563a19de
< X-CouchDB-Body-Time: 0
<
* Connection #0 to host localhost left intact
<h1>test</h1>
```
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