Jetty client http error code 412 - http

Question

I am accessing one website (I am hiding origin website name as it is against the policy) using browser and jetty/apache httpclient.
The website works fine with web browser.
Using api I am able to login into website,gets the session cookie JSESSIONID and home page html content. But after that when I submit any form or call the links from html I receive the HTTP error code 412(Pre condition failed).
I understand this error is due problem in client header. I set all the headers from browser(checked using inspect element in chrome browser). Still I have the same error.
I am not able to track down which header is causing the problem.
Here is the Header from browser
Request Headers
Accept:text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,/;q=0.8
Accept-Encoding:gzip, deflate
Accept-Language:en-GB,en-US;q=0.8,en;q=0.6
Cache-Control:max-age=0
Connection:keep-alive
Content-Length:318
Content-Type:application/x-www-form-urlencoded
Cookie:language=en_IN; __gads=ID=14c64d8f9fd7de54:T=1424658276:S=ALNI_Mba1kvJO4mLo7R-T2jUJE9zCYck5A; SLB_Cookie=ffffffff09461c2d45525d5f4f58455e445a4a422971; JSESSIONID=36m4Oo6dCML_Wvx-Wgmm9rtLh9mbURxnZhWIVwg-zHaNzFQeUt9C!-1989013783; _ga=GA1.3.379900459.1428120216
Host:www.irctc.co.in
Origin:https://www.example.com
Referer:https://www.example.com/context/home
Upgrade-Insecure-Requests:1
User-Agent:Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.157 Safari/537.36
Same header I am setting from jetty client.
Request request = httpClient.newRequest(url);
request.method(HttpMethod.POST);
request.agent(USER_AGENT);
request.accept("text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8");
request.header(HttpHeader.REFERER,"https://www.example.com/context/home");
request.header(HttpHeader.ACCEPT_ENCODING, "gzip, deflate");
request.header(HttpHeader.ACCEPT_LANGUAGE, "en-GB,en-US;q=0.8,en;q=0.6");
request.header(HttpHeader.CACHE_CONTROL, "max-age=0");
request.header(HttpHeader.CONNECTION, "keep-alive");
request.header(HttpHeader.CONTENT_TYPE, "application/x-www-form-urlencoded");
request.header(HttpHeader.HOST, "www.example.com);
for (Map.Entry<String, String> entry : params.entrySet()){
request.param(URLEncoder.encode(entry.getKey(), "UTF-8"), URLEncoder.encode(entry.getValue(), "UTF-8"));
if(!StringUtils.isEmpty(content)){
content+="&";
}
content+=URLEncoder.encode(entry.getKey(), "UTF-8")+"="+URLEncoder.encode(entry.getValue(), "UTF-8");
}
request.header(HttpHeader.CONTENT_LENGTH, ""+content.length());
I see JSESSIONID and SLB_Cookie are present in the request. Since the website is out of our control I really can not track what is the issue.
Please help me to resolve this issue. Any pointers to resolve the issue on client side is appreciated. is there any way we can make sure which header causing this issue.

Answer 1

I solved the problem.
Issue with the form parameters value. I was sending encoded values where were encoded by jetty client again