How to Resolve 'urllib2.HTTPError: HTTP Error 403: Forbidden' When Downloading Stock Data?

403 Forbidden: Resolving URL Open Error Using urllib2

In the context of automating stock data downloads using Python's urllib2, a common error arises when attempting to retrieve a CSV file from a specific URL. This issue manifests as "urllib2.HTTPError: HTTP Error 403: Forbidden."

To resolve this error, it is imperative to augment the HTTP request with appropriate headers. The original code included a User-Agent header, but further headers are required:

hdr = {'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.64 Safari/537.11',
       'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
       'Accept-Charset': 'ISO-8859-1,utf-8;q=0.7,*;q=0.3',
       'Accept-Encoding': 'none',
       'Accept-Language': 'en-US,en;q=0.8',
       'Connection': 'keep-alive'}

Adding these headers to the request resolves the 403 Forbidden error. Interestingly, the error can be mitigated by including just one additional header, 'Accept': 'text/html,application/xhtml xml,application/xml;q=0.9,/;q=0.8'.

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