I maintain an application that uses libcurl to connect to Microsoft Exchange servers. This is usually outlook.office365.com but can also be private Exchange servers.
I recently updated libcurl from 7.64.1 to 7.71.1 and I'm experiencing a problem on one particular private server. A POST operation comes back with http error 415 (unsupported media type) and the http feed has the specific error text "Cannot process the message because the content type 'application/x-www-form-urlencoded' was not the expected type 'text/xml; charset=utf-8'. This seems straightforward enough, except that my code *is* explicitly setting the content-type header to be "text/html; charset=utf-8". I do this via CURLOPT_HTTPHEADER. I have checked and re-checked, and there is no doubt that the curl_slist contains that header. Further proof is that when I use this code to connect to outlook.office365.com, it works fine and I can see the header in the returned feed, e.g.: Host: outlook.office365.com User-Agent: comaxis-agent/1.0 Accept: */* X-AnchorMailbox: jjo...@transend.onmicrosoft.com X-PreferServerAffinity: true Content-Type: text/xml; charset=utf-8 Content-Length: 914 When I look at the log from the affected server, the headers look like this: Host: 10.94.194.138 Authorization: NTLM TlRMTVNTUAAD... User-Agent: comaxis-agent/1.0 Accept: */* X-AnchorMailbox: xxxx...@ca.ibm.com X-PreferServerAffinity: true Content-Length: 1099 Content-Type: application/x-www-form-urlencoded I have never set the content-type to "application/x-www-form-urlencoded". And when I use my exact same code on this server, except switching back to libcurl 7.64, the problem goes away, and I see the correct content-type header in the logging. Can anybody tell me what the issue is with 7.71? Or something in my code? I needed to use that version to solve a separate SSL issue, so I don't want to go backward at this point. The affected server is running Windows Server 2016, IIS 10.0. ------------------------------------------------------------------- Unsubscribe: https://cool.haxx.se/list/listinfo/curl-library Etiquette: https://curl.haxx.se/mail/etiquette.html
