I did this

I have a situation where I need to get UIDL for specific message number in POP3 mailbox. Used following

curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "UIDL 1"))

But it does't work. libcurl gets stuck waiting for data until timeout. (It only works with CURLOPT_NOBODY set to 0).

POP3 expects "\x0d\x0a\x2e\x0d\x0a" (CRLF.CRLF) even for single-line response for certain commands. I have seen this with following commands UIDL msg, STAT, RSET, NOOP etc.

Question:

Is there any workaround to store response data from custom POP3 requests, which return single line response with EOB as "CRLF"?

(I don't want to use "UIDL" that returns list of msg, UIDL pair and parse it to get specific UIDL)

I expected the following

When performing "UIDL msg", curl_easy_perform should return immediately after receiving + OK < msg > < UIDL > CRLF

curl/libcurl version

curl 7.45.0
curl 7.45.0 (x86_64-pc-linux-gnu) libcurl/7.45.0 OpenSSL/1.0.1f zlib/1.2.8 libidn/1.28 libssh2/1.4.4_DEV librtmp/2.3
Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps pop3 pop3s rtmp rtsp scp sftp smb smbs smtp smtps telnet tftp
Features: IDN IPv6 Largefile NTLM NTLM_WB SSL libz TLS-SRP UnixSockets

operating system

Ubuntu 14.04.3 LTS
3.11.0-26-generic