Content-Type header [application/x-www-form-urlencoded] is not supported [duplicate]

Question

I have integrated Elasticsearch (Version 5.5) into Gitlab and try to use it. This is the command I send from an external windows client:

curl -XGET gitlab.server:9200/ -H 'Content-Type: application/json' -d '{"query": {"simple_query_string" : {"fields" : ["content"], "query" : "foo bar -baz"}}}' 

but it doesn't work. On the client I get these errors:

{"error":"Content-Type header [application/x-www-form-urlencoded] is not supported","status":406}
curl: (6) Could not resolve host: text
curl: (3) [globbing] unmatched brace in column 1
curl: (3) Bad URL, colon is first character
curl: (3) [globbing] unmatched brace in column 1
curl: (3) Bad URL, colon is first character
curl: (3) [globbing] bad range in column 2
curl: (6) Could not resolve host: query
curl: (3) Bad URL, colon is first character
curl: (3) [globbing] unmatched close brace/bracket in column 13

On the server in /var/log/elasticsearch/elasticsearch.log I can see no log messages.

However, running the same exact command as above from the linux server gives me a response without errors:

{   "name" : "name",   "cluster_name" : "elasticsearch",   "cluster_uuid" : "uuid",   "version" : {     "number" : "5.5.0",     "build_hash" : "260387d",     "build_date" : "2017-06-30T23:16:05.735Z",     "build_snapshot" : false,     "lucene_version" : "6.6.0"   },   "tagline" : "You Know, for Search" } 

I tried adding http.content_type.required: true to the elasticsearch.yml, but the problem was the same. So, what am I doing wrong here? Why do I get a "Content-Type header not supported" from the Windows client? How can I solve this?

After changing the ' to " like this:

curl -XGET gitlab.server:9200/ -H "Content-Type: application/json" -d "{"query": {"simple_query_string" : {"fields" : ["content"], "query" : "foo bar -baz"}}}" 

I recieve this response:

{   "name" : "name",   "cluster_name" : "elasticsearch",   "cluster_uuid" : "uuid",   "version" : {     "number" : "5.5.0",     "build_hash" : "260387d",     "build_date" : "2017-06-30T23:16:05.735Z",     "build_snapshot" : false,     "lucene_version" : "6.6.0"   },   "tagline" : "You Know, for Search" } curl: (6) Could not resolve host: bar 

Answer 1

After changing the enclosing quotes from ' to ", escape the quotation marks " used inside the parameters as below:

curl -XGET gitlab.server:9200/ -H "Content-Type: application/json" -d "{\"query\": {\"simple_query_string\" : {\"fields\" : [\"content\"], \"query\" : \"foo bar -baz\"}}}" 

An alternative is to put the json into a file, and use the @ prefix for the parameters.

json.txt

{   "query": {     "simple_query_string" : {        "fields" : ["content"],        "query" : "foo bar -baz"     }   } } 

and run curl as below:

curl -XGET gitlab.server:9200/ -H "Content-Type: application/json" -d @json.txt