Cyrill Osterwalder posted a detailed analysis about a bug that occurs when
using a custom Host: header and curl fails to send a request on a re-used persistent connection and thus creates a new connection and resends it. It then sent two Host: headers. Cyrill's analysis was posted here: http://curl.haxx.se/mail/archive-2005-01/0022.html
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@@ -342,7 +342,7 @@ CURLMcode curl_multi_perform(CURLM *multi_handle, int *running_handles)
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gotourl = strdup(easy->easy_handle->change.url);
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if(gotourl) {
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easy->easy_handle->change.url_changed = FALSE;
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easy->result = Curl_follow(easy->easy_handle, gotourl);
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easy->result = Curl_follow(easy->easy_handle, gotourl, FALSE);
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if(CURLE_OK == easy->result)
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easy->state = CURLM_STATE_CONNECT;
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else
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@@ -518,7 +518,7 @@ CURLMcode curl_multi_perform(CURLM *multi_handle, int *running_handles)
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easy->easy_conn->newurl = NULL;
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easy->result = Curl_done(&easy->easy_conn, CURLE_OK);
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if(easy->result == CURLE_OK)
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easy->result = Curl_follow(easy->easy_handle, newurl);
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easy->result = Curl_follow(easy->easy_handle, newurl, FALSE);
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if(CURLE_OK == easy->result) {
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easy->state = CURLM_STATE_CONNECT;
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result = CURLM_CALL_MULTI_PERFORM;
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