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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Headers not being passed back to ALB","articleBody":"Firstly thanks for this awesome project.  I have my lambda functions being called by the ALB and it looks like the headers that I set in my php code are not being sent back in the `headers` field of the json response back to the ALB.  Therefore, I cannot set the content type for my responses so they always end up being octet-stream.  This is my very simple php function:\r\n\r\n```\r\n\u003c?php\r\n  header('Content-Type: text/html');\r\n  phpinfo();\r\n?\u003e\r\n```\r\n\r\nand when the response reaches my browser via the ALB, the content type is the default octet-stream.  According to the [AWS Lambda Functions as Targets](https://docs.aws.amazon.com/elasticloadbalancing/latest/application/lambda-functions.html#respond-to-load-balancer) the response that bootstrap needs to send back to the ALB must be json like this:\r\n\r\n```\r\n{\r\n    \"isBase64Encoded\": false,\r\n    \"statusCode\": 200,\r\n    \"statusDescription\": \"200 OK\",\r\n    \"headers\": {\r\n        \"Set-cookie\": \"cookies\",\r\n        \"Content-Type\": \"application/json\"\r\n    },\r\n    \"body\": \"Hello from Lambda (optional)\"\r\n}\r\n```\r\n\r\nI could be mistaken, but I believe bootstrap is failing to set the `headers` field in that json response.\r\n\r\nAny assistance would be appreciated.  Thanks.\r\n","author":{"url":"https://github.com/shamimmirzai","@type":"Person","name":"shamimmirzai"},"datePublished":"2019-06-13T21:11:52.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/41/php-lambda-layer/issues/41"}