Header parameter missing when making POST request using Rest-Client Ruby Gem - ruby

Question

Hi I am successfully able to post from Post man , but unable to do so from Ruby Rest client.
Post details
Post Man Request
POST /endpoint HTTP/1.1
Host: host:11400
Accept: application/json
HTTP_USER: userid
fname: fname
lname: lname
Content-Type: application/json
Cache-Control: no-cache
Postman-Token: 589a5345-e384-bd71-d690-60987165487b
{ "rtdt":"09/08/2016","jobs":[{"pid":53} , {"pid":54}]}
the rest code I ve tried multiple ways including below
method tried
p RestClient.post 'http://url_details',
Accept: 'application/json',
'HTTP_USER'.to_sym => 'userid',
fname: 'name',
lname: '',
'Content-Type'.to_sym => 'application/json',
payload: JSON.parse('{ "rtdt":"09/08/2016","jobs":[{"pid":53} , {"pid":54}]}')
method tried
p RestClient.post 'http://url_details/job', http_user: 'userid', content_type: :json, accept: :json
method tried
p #uber_ride = (RestClient::Request.execute(
:method => :post,
:url => 'http://url_details/job',
'HTTP_USER' => 'userid',
:headers => {:content_type => 'application/json', :accept => 'application/json', :HTTP_USER => 'userid', :fname => 'name', :lname => 'lname'}
))
method tried
p '++++++++++++++++++++++++++++++++'
p RestClient.post($Current_Api_Endpoint,
$Current_Payload,
:http_user =>'userid',
headers:
{:accept => 'application/json',
:content_type => 'application/json',
:http_user =>'userid',
:fname => 'name',
:lname => 'lname'}
)
p '++++++++++++++++++++++++++++++++'
method tried
p env1 = ENV['http_proxy']
# p a = {:method => :post, :url => 'http://url_details/job', :headers => { :accept => 'application/json', :content_type => 'application/json', :http_user => 'userid', :fname => 'name', :lname => 'lname' }, :payload => { :rtdt => "06/10/2016",:jobs => [{:pid => 53} , {:pid => 54}]} }
p a = {
method: 'post',
url: 'http://url_details/job',
proxy: ENV['http_proxy'],
headers: {accept: 'application/json', content_type: 'application/json', http_user: 'userid', fname: 'name', lname: 'lname'},
payload: { rtdt: '06/10/2016', jobs: {pid: 53}}
}
I am getting error
HTTP Status 500 - HTTP_USER header not found in request
torg.springframework.security.web.authentication
I Found out the issue since then. All headers are able to be sent, except this one - This one in CAPS. rest of them in small characters. How to solve it

Answer 1

Ruby's Net::HTTP implementation does not transmit ALL_CAPS_UNDERSCORED header names. RestClient relies on Net::HTTP. So, for example, the HTTP_USER header is actually transformed into Http_user when transmitted.
Alertnative: curb
Curl, however, does not have this limitation. It transmits header names verbatim. Therefore instead of using RestClient, you could use the curb gem, which is a wrapper around libcurl. This seems to work:
require "curb"
Curl::Easy.http_post("http://URL_REDACTED") do |http|
http.headers["Accept"] = "application/json"
http.headers["Content-Type"] = "application/json"
http.headers["HTTP_USER"] = "userid"
http.post_body = '{ "rtdt":"09/08/2016","jobs":[{"pid":53} , {"pid":54}]}'
end
Alternative: excon
The excon gem is another possibility. It implements HTTP in pure Ruby, without relying on Net::HTTP. It does its own header processing and allows ALL_CAPS headers. So this should work:
require "excon"
Excon.post(
"http://URL_REDACTED",
:headers => {
"Accept" => "application/json",
"Content-Type" => "application/json",
"HTTP_USER" => "userid"
},
:body => '{ "rtdt":"09/08/2016","jobs":[{"pid":53} , {"pid":54}]}'
)
Anyway, I would argue that the server you are trying to connect to is ultimately at fault here, because headers are supposed to be evaluated as case-insensitive: Are HTTP headers case-sensitive?. If the server requires a header be in all uppercase, that is a bug.

Answer 2

The RestClient README examples indicate that the correct usage is:
RestClient.post(url, payload, headers)
So all you have to do is:
RestClient.post(
"http://URL_REDACTED",
'{ "rtdt":"09/08/2016","jobs":[{"pid":53} , {"pid":54}]}',
content_type: :json,
accept: :json,
"HTTP_USER" => "userid"
)
I tested against http://requestb.in and got the expected headers and body:
HEADERS
Total-Route-Time: 0
Connection: close
Via: 1.1 vegur
Connect-Time: 0
Http-User: userid
Content-Type: application/json
Content-Length: 55
User-Agent: rest-client/2.0.0 (darwin15.4.0 x86_64) ruby/2.3.1p112
X-Request-Id: c7cd819f-8901-41b9-8cbb-3b6d1895cd67
Accept-Encoding: gzip
Host: requestb.in
Accept: application/json
RAW BODY
{ "rtdt":"09/08/2016","jobs":[{"pid":53} , {"pid":54}]}