to not check for zlib header bytes. This is not preventable AFAICS.
LFS dependant parts of libcurl are left out because of off_t,
respectively off64_t confusion.
+ Persistent handles and "cookiestore" request option do interfere,
+ as libcurl safes the cookies to the file on curl_easy_destroy(),
+ cookies are not safed until the CURL handle will be recycled.
+ Thus one would either need to
+ * run PHP with http.persistent.handles.limit = 0
+ * call http_persistent_handles_clean() every request
+ * call $HttpRequest->flushCookies(), which is available
+ since libcurl v7.17.1 and does not work with the
+ procedural API
+ Anyway, none of these options is really perfect.
+ HTTP and Proxy authentication inforamtion (username/password) can not be
+ unset with NULL prior libcurl v7.19.6 and separarte options for setting
+ username and password--wich work--are only available since v7.19.6.