Description:
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If I do two back-to-back queries to our server using two different server aliases (pointing to same server) first query executes successfully but second query always causes HTTP error 400. 

Apache ssl_error_log has an "Hostname www.server.com provided via SNI and hostname alias.server.com provided via HTTP are different" describing the 400 error.

Our server has Apache 2.2.15, OpenSSL 1.0.1e and cURL 7.19.7.

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Workaround is to use stream_context_create with SNI_enabled and SNI_server_name options.

Test script:
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function doCurl($url) {
    $ch = curl_init($url);        
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);        
    $result = curl_exec($ch);
    $code = curl_getinfo($ch, CURLINFO_HTTP_CODE);        
    curl_close($ch);        
    return $code;    
}
    
echo "HTTP Status: ".doCurl("https://www.server.com")."\n";
echo "HTTP Status: ".doCurl("https://alias.server.com")."\n";

Expected result:
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HTTP Status: 200
HTTP Status: 200

Actual result:
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HTTP Status: 200
HTTP Status: 400