Headers already sent

[kratkar]

After added in actions

        'captcha' => [
            'class' => 'juliardi\captcha\CaptchaAction',
        ]

an error appears on page site/captcha

An Error occurred while handling another error:
yii\web\HeadersAlreadySentException: Headers already sent in /var/www/html/vendor/gregwar/captcha/src/Gregwar/Captcha/CaptchaBuilder.php on line 561. in /var/www/html/vendor/yiisoft/yii2/web/Response.php:366
Stack trace:
#0 /var/www/html/vendor/yiisoft/yii2/web/Response.php(339): yii\web\Response->sendHeaders()
#1 /var/www/html/vendor/yiisoft/yii2/web/ErrorHandler.php(135): yii\web\Response->send()
#2 /var/www/html/vendor/yiisoft/yii2/base/ErrorHandler.php(111): yii\web\ErrorHandler->renderException(Object(yii\web\HeadersAlreadySentException))
#3 [internal function]: yii\base\ErrorHandler->handleException(Object(yii\web\HeadersAlreadySentException))
#4 {main}
Previous exception:
yii\web\HeadersAlreadySentException: Headers already sent in /var/www/html/vendor/gregwar/captcha/src/Gregwar/Captcha/CaptchaBuilder.php on line 561. in /var/www/html/vendor/yiisoft/yii2/web/Response.php:366
Stack trace:
#0 /var/www/html/vendor/yiisoft/yii2/web/Response.php(339): yii\web\Response->sendHeaders()
#1 /var/www/html/vendor/yiisoft/yii2/base/Application.php(392): yii\web\Response->send()
#2 /var/www/html/frontend/web/index.php(18): yii\base\Application->run()
#3 {main}

I think it should be like this:

//in CaptcahAction@run
return $this->captchaBuilder->get(); // instead of $this->captchaBuilder->output();

It works.

[kratkar]

And i think $this->captchaBuilder->get() and $this->captchaBuilder->output() generated jpg. CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), quality = 90

[juliardi]

Hello @kratkar , sorry for the late response. While I can't reproduce the error you found, I think your suggestion is good and I tried to follow it. This library now uses

return $this->captchaBuilder->get($quality);

instead of

$this->captchaBuilder->output();

It also support the quality parameter to set the generated image quality. You can find the usage in README.md. The Content-Type header also changed from image/png to image/jpeg. I hope this can solve the error you found.