Blob images are saving with http (non secure connection ) , How can i set blog image with https.

Question

I am getting error like this -

Mixed Content: The page at 'https://mywebsite.com/qa/514/my-question-title' was loaded over HTTPS, but requested an insecure image 

   'http://mywebsite.com/qa/ qa=blob&qa_blobid=12291915621289'. This content should also be served over HTTPS.

How to redirect all images on secure (https) connection. 

Comments

You need to change your Domain from 'http' to 'https' on:
Admin > General Settings

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I already set to https in general settings but how can I set old images secure https? Many images are stored with Http.

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Is there any way to update all old images from http to https with any plugin or query?

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You'll have to go to trough every post and replace all images/links URL with 'https'.
You could also do it with Javascript but it's best you do it the proper way. The first way.