How to filter the results for specific headers?

Needed from a specified list of links save only those, that return .doc or .pdf file, while its size should be no larger than 3 MB.

Solved this problem is quite simple:

• Filter the results by the required content-type: application/msword or application/pdf
• Scraping content-lenght - is the size of the returned file
• Filter the results by size - no more than 3 MB
• Download only headers - for saving time

*What are MIME-types: http://www.freeformatter.com/mime-types-list.html#mime-types-list
**If you do not turn on option Read only headers and output to result $data, generating unique file names, you can organize downloading of files certain formats and sizes.

Spoiler: Code for import

Code:

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