php - Issue integrating the Open Graph meta tag -

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i trying integrate open graph , twitter card on site. works fine until add meta tag:

<meta property="og:image" itemprop="image primaryimageofpage" name="twitter:image" content="my-site-name.com/resources/images/logo.png" />

at stage, headers sent error.

however, if trim down length of image url, logo.png, error disappears.

is there doing wrong? there maximum length value content attribute of meta tags?

try changing 

content="my-site-name.com/resources/images/logo.png"

to this:

content="http://my-site-name.com/resources/images/logo.png"

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