POP3: UIDL for message

From: Сергей - via curl-library <curl-library_at_lists.haxx.se>
Date: Tue, 30 May 2023 14:30:44 +0700

I'm trying to get a UIDL via POP3 for a specific message, but libcurl
freezes. Receiving UIDL for all messages works fine.

My simple example:

    CURL *curl;

    CURLcode res = CURLE_OK;

    curl = curl_easy_init();

    char* cmd1="UIDL";

    curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);

    curl_easy_setopt(curl, CURLOPT_USERNAME, user);

    curl_easy_setopt(curl, CURLOPT_PASSWORD, password);

    curl_easy_setopt(curl, CURLOPT_URL, host);

    curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, curl_response_headers);

    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_read);

    curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, cmd1);

    res = curl_easy_perform(curl);
/* Here we successfully receive some headers+data like this
1 000002885ffbcd352 000002895ffbcd35
3 0000028a5ffbcd35
*/

    // but if i want to get uidl for specific message:

    char* cmd2="UIDL 1";

    curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);

    curl_easy_setopt(curl, CURLOPT_USERNAME, user);

    curl_easy_setopt(curl, CURLOPT_PASSWORD, password);

    curl_easy_setopt(curl, CURLOPT_URL, host);

    curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, curl_response_headers);

    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_read);

    curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, cmd2);

    res = curl_easy_perform(curl);
/*i receive headers with (that's actually expected)
+OK 1 000002885ffbcd35#015
and curl_easy_perform() freezes until timeout reached
*/
How i can correctly receive uidl for message

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Received on 2023-05-30