PHP Curl result giving trouble? - php

Question

I am working with NCBI Blast api. I created logic to get result in xml format but result is comming in html format and this result again going back to redirect to display xml format. when i check original url in browser it shows direct xml data. Can any one give me solutions.
Visit this url you can find my problem peerscientist.net. This is the code.
class BlastAPI{
public function blastdata(){
$url = "https://blast.ncbi.nlm.nih.gov/Blast.cgi?CMD=Put&QUERY=SSWWAHVEMGPPDPILGVTEAYKRDTNSKK&PROGRAM=blastp&FILTER=L&DATABASE=nr&FORMAT_TYPE=XML";
$ncontent = $this->rid($url);
echo '<br/>RID :'.$ncontent.'<br/>';
$geturl = $this->geturl($ncontent);
echo $geturl;
$fulldata = $this->getfullData($geturl);
if($fulldata != ''){
echo '<pre>';
var_dump($fulldata);
echo '</pre>';
}else{
echo "Code Once";
}
}
public function rid($url){
$surl = $url;
echo $surl;
//header('Content-type: text/html');
$content = file_get_contents($surl);
$doc = new DOMDocument();
libxml_use_internal_errors(true);
$doc->loadHtml($content);
libxml_use_internal_errors(false);
$data = $doc->getElementById("rid");
$rid = $data->getAttribute('value');
return $rid;
}
public function geturl($rid){
$srid = $rid;
$mainurl = "https://blast.ncbi.nlm.nih.gov/Blast.cgi?CMD=Get&RID=$srid&FORMAT_TYPE=XML&DESCRIPTIONS=200&ALIGNMENTS=200&NOHEADER=true";
return $mainurl;
}
public function getfullData($url){
$murl = $url;
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $murl);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
$str = curl_exec($curl);
curl_close($curl);
if ($str === FALSE) {
echo "cURL Error: " . curl_error($curl);
}
return $str;
}
}
$nblast = new BlastAPI();
$nblast->blastdata();