#extracted captcha picture before, and catched user's reply in $captcha  
#trying to submit captcha code:
$param="numIg=&numDgc=&numIgc=&numIp=&pageSize=3&strWhere='.$mySearch.'&numDg=&numIpc=&numUgc=&numUgd=&strLicenseCode=&numIgd=&showType=1&numSortMethod=&strSources=&numUg=&pageNow=1&vct='.$captcha.'&Submit=%E7%BB%A7%E7%BB%AD";

$Search_url ="one website";
$request = HTTP::Request->new('POST', $Search_url);
$request->header('Accept' => 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8'); 
#$request->header('Accept-Language' => 'de,en-US;q=0.7,en;q=0.3');
$request->header( 'Referer' => "one webiste");


$request->header('Connection' => 'keep-alive'); 
$request->content($param);
$response = $ua->request($request);
$page = $response->decoded_content();
print $page;


##</code><code>##

Request Header
Host: website
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Firefox/52.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: de,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate
Referer: website
Cookie: _gscu_1718069323=94938064vupi3q75; _gscu_7281245=960585782o5hwt18; fp_ver=4.2.3; BSFIT_CLICK_ARRAY=; _va_id=6af9c5bacce82b34.1497256276.9.1500561808.1500561808.; _va_ref=%5B%22%22%2C%22%22%2C1500561808%2C%22http%3A%2F%2Fepub.sipo.gov.cn%2Fpatentoutline.action%22%5D; BSFIT_EXPIRATION=1499900863032; BSFIT_OkLJUJ=FCPai-v72cPAKxWwXtmw7Q5V23KeTUXF; BSFIT_DEVICEID=DJtgNB-72bmDzc9ryT1Cgn-fF8rxZOW3kAgDU2FyxVGjzC7zxS49h52Qp1ACtmLH80ib8FDb4CmAPGjJLNEZapA7Wp83mJtoq2ZD4U1hXHNjGYkHEss9Rd21Z7bHaoRKU4o5N6CCTPsB36cPMQwXSxGrZuTY7XRd; br_access_code=ZrbCHtqr/h8AAAAATpJHWQAAAABmB0vG; JSESSIONID=7F350E89175BADCBEEDEA44B6F12F4EA; WEB=20111116; _gscbrs_7281245=1; _gscs_7281245=t009042585zmvlf21|pv:5
Connection: keep-alive
Upgrade-Insecure-Requests: 1

##</code><code>##

Request Body
ontent-Type: application/x-www-form-urlencoded
Content-Length: 267

numIg=&numDgc=&numIgc=&numIp=&pageSize=20&strWhere=%27.%E6%97%A0%E5%88%B7%E7%94%B5%E6%9C%BA.%27&numDg=&numIpc=&numUgc=&numUgd=&strLicenseCode=&numIgd=&showType=1&numSortMethod=&Submit=%E7%BB%A7%E7%BB%AD&strSources=&numUg=&pageNow=1&vct=y23m4&Submit=%E7%BB%A7%E7%BB%AD