Error "session_start(): Ignoring session_start() because a session is already active"

Question

Hello, 
 
 we got a weird issue on our DEV environnment ; the error message we got is " session_start(): Ignoring session_start() because a session is already active ". Our dev is running under PHP 8.0. 
 This message is happening when a custom job tries to call, using External Resource Client, a external API. 
 The code was working when using CURL's call. We followed this article to transform our code : 
 https://support.sugarcrm.com/Documentation/Sugar_Developer/Sugar_Developer_Guide_12.3/Integration/ExternalResourceClient/#Examples_of_Replacing_cURL 
 We do not open any session from our code ; we suppose this error is linked to the file_get_contents instruction (line 241) of 
 src\Security\HttpClient\ExternalResourceClient.php 
 (but not for sure). 
 
 Any help, suggestion or whatever is welcome. 
 
 Fred

Frédéric Rinaldi · Answer

Got it ; our error was to set the timeout to 0. 
 We were thinking that 0 means no timeout at all, instead of what it means I won't wait any seconds :-). 
 So obviously our query failed because it takes more then 0 second. 
 
 Thank you for your support Rodrigo Manara