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drupal_http_request() only checks for CRLF as a header/body seperator. Although it parses headers that have LF-only, it actually uses the sequence CRLFCRLF to split the headers and the response.
Although this strictly compiles with section 2.2 of RFC 1945 (http://www.faqs.org/rfcs/rfc1945.html) it does not implement the recommendation in Appendix B that states applications should be tolerant and allow for LF-only responses.
As a side note, I am having this issue trying to work with Canada Post's SellOnline HTTP service. I have notified them of the issue but still feel this is easily fixed in Drupal, and so here is a patch:
--- common.inc.orig 2007-10-14 15:58:22.000000000 -0400 +++ common.inc 2007-10-14 15:59:28.000000000 -0400 @@ -472,7 +472,7 @@ fclose($fp); // Parse response. - list($split, $result->data) = explode("\r\n\r\n", $response, 2); + list($split, $result->data) = preg_split("/\r\n\r\n|\n\n|\r\r/", $response, 2); $split = preg_split("/\r\n|\n|\r/", $split); list($protocol, $code, $text) = explode(' ', trim(array_shift($split)), 3);