How can add Custom Http Header

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Hello everyone :D I have a question. I need to add custom http headers. However, the error appears as shown in the attached image. What did I do wrong? please let me know   
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1 answers
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You are using the wrong type of single quotes. It looks like you are using ones with angles. You need to use the following.

 

'application=value'

 

I hope this helps.

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