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Re: imap-send with gmail: curl_easy_perform() failed: URL using bad/illegal format or missing URL

On Thu, 30 Nov 2017, Nicolas Morey-Chaisemartin wrote:

This is due to the weird "[Gmail]" prefix in the folder.
I tried manually replacing it with:
        folder = %5BGmail%5D/Drafts
in .git/config and it works.

curl is doing some fancy handling with brackets and braces. It make sense for multiple FTP downloads like ftp://ftp.numericals.com/file[1-100].txt, not in our case. The curl command line has a --globoff argument to disable this "regexp" support and it seems to fix the gmail case. However I couldn't find a way to change this value through the API...

That's just a feature of the command line tool, "globbing" isn't a function provided by the library. libcurl actually "just" expects a plain old URL.

But with the risk of falling through the cracks into the rathole that is "what is a URL" (I've blogged about the topic several times in the past and I will surely do it again in the future):

A "legal" URL (as per RFC 3986) does not contain brackets, such symbols should be used URL encoded: %5B and %5D.

This said: I don't know exactly why brackets cause a problem in this case. It could still be worth digging into and see if libcurl could deal with them better here...


 / daniel.haxx.se