Yii2: Fatal error: Uncaught yii\web\HeadersAlreadySentException: Headers already sent in

Created on 7 Sep 2019 · 5Comments · Source: yiisoft/yii2

Hi ,
i have this error in my project

Fatal error: Uncaught yii\web\HeadersAlreadySentException: Headers already sent in /home/es/domains/es/public_html/vendor/yiisoft/yii2/web/Response.php on line 428. in /home/es/domains/es/public_html/vendor/yiisoft/yii2/web/Response.php:366 Stack trace: #0 /home/es/domains/es/public_html/vendor/yiisoft/yii2/web/Response.php(339): yii\web\Response->sendHeaders() #1 /home/es/domains/es/public_html/vendor/yiisoft/yii2/web/ErrorHandler.php(135): yii\web\Response->send() #2 /home/es/domains/es/public_html/vendor/yiisoft/yii2/base/ErrorHandler.php(262): yii\web\ErrorHandler->renderException(Object(yii\base\ErrorException)) #3 [internal function]: yii\base\ErrorHandler->handleFatalError() #4 {main} thrown in /home/es/domains/es/public_html/vendor/yiisoft/yii2/web/Response.php on line 366

first time Yii2 version was 2.0.25, i updated that to 2.0.26 but this problem stayed that,
again i changed that to 2.0.23 but not solved, php version is 7.3.7
this project dont have any problem in local server but have just problem in host server
and some times dont have error but more times have error
below error is exist in host server too
(https://user-images.githubusercontent.com/18082695/64474404-cf4a7980-d189-11e9-9732-94457eec7c92.jpeg)

please help me ,
thank you

question

Source

mhejini

Most helpful comment

Such behavior is there since 2.0.14. Prior to that version in case there was output started, headers were silently not sent resulting in hard to debug issues.

In your case fix your php.ini first then check if error is still there.

samdark on 7 Sep 2019

👍2

All 5 comments

Such behavior is there since 2.0.14. Prior to that version in case there was output started, headers were silently not sent resulting in hard to debug issues.

In your case fix your php.ini first then check if error is still there.

samdark on 7 Sep 2019

👍2

Thank you for your question.
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yii-bot on 7 Sep 2019

Such behavior is there since 2.0.14. Prior to that version in case there was output started, headers were silently not sent resulting in hard to debug issues.

In your case fix your php.ini first then check if error is still there.

thanks for your reply
yes i told to the supporter that solving this problem , they told me that mysql.so dont supporting with php 7.3!!
how can i solve this problem mysql.so in php 7.3.7?

mhejini on 7 Sep 2019

You don't need mysql.so at all. Yii does not use it so remove it from php.ini.

samdark on 7 Sep 2019

👍1