RuntimeException: Failed to start the session because headers have already been sent

Created on 14 February 2017, almost 8 years ago
Updated 16 February 2023, almost 2 years ago

My recent log have a lot of this error (every page not found create one error):

RuntimeException: Failed to start the session because headers have already been sent by "mysite.com/public_html/vendor/symfony/http-foundation/Response.php" at line 1276. in Symfony\Component\HttpFoundation\Session\Storage\NativeSessionStorage->start() (line 141 of mysite.com/public_html/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php) #0 mysite.com/public_html/core/lib/Drupal/Core/Session/SessionManager.php(164): Symfony\Component\HttpFoundation\Session\Storage\NativeSessionStorage->start() #1 mysite.com/public_html/core/lib/Drupal/Core/Session/SessionManager.php(195): Drupal\Core\Session\SessionManager->startNow() #2 mysite.com/public_html/vendor/symfony/http-foundation/Session/Session.php(193): Drupal\Core\Session\SessionManager->save() #3 mysite.com/public_html/core/lib/Drupal/Core/StackMiddleware/Session.php(60): Symfony\Component\HttpFoundation\Session\Session->save() #4 mysite.com/public_html/core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php(47): Drupal\Core\StackMiddleware\Session->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #5 mysite.com/public_html/core/modules/page_cache/src/StackMiddleware/PageCache.php(184): Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #6 mysite.com/public_html/core/modules/page_cache/src/StackMiddleware/PageCache.php(121): Drupal\page_cache\StackMiddleware\PageCache->fetch(Object(Symfony\Component\HttpFoundation\Request), 1, true) #7 mysite.com/public_html/core/modules/page_cache/src/StackMiddleware/PageCache.php(75): Drupal\page_cache\StackMiddleware\PageCache->lookup(Object(Symfony\Component\HttpFoundation\Request), 1, true) #8 mysite.com/public_html/core/modules/ban/src/BanMiddleware.php(50): Drupal\page_cache\StackMiddleware\PageCache->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #9 mysite.com/public_html/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php(47): Drupal\ban\BanMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #10 mysite.com/public_html/core/lib/Drupal/Core/StackMiddleware/NegotiationMiddleware.php(50): Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #11 mysite.com/public_html/vendor/stack/builder/src/Stack/StackedHttpKernel.php(23): Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #12 mysite.com/public_html/core/lib/Drupal/Core/DrupalKernel.php(664): Stack\StackedHttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #13 mysite.com/public_html/index.php(19): Drupal\Core\DrupalKernel->handle(Object(Symfony\Component\HttpFoundation\Request)) #14 {main}.

Site still running good but this error keep flood my log.

🐛 Bug report
Status

Closed: works as designed

Version

8.8 ⚰️

Component
Other 

Last updated about 9 hours ago

Created by

🇻🇳Vietnam tran_tien

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