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multi: close the connection when h2=>h1 downgrading

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Otherwise libcurl is likely to reuse the connection again in the next
attempt since the connection reuse logic doesn't take downgrades into
account.

Reported-by: Anthony Ramine
Fixes #6788
Closes #6793
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Daniel Stenberg 2021-03-25 13:13:18 +01:00
parent db4e0bd85f
commit 7b6bfd2d78
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lib/multi.c
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@ -2158,6 +2158,7 @@ static CURLMcode multi_runsingle(struct Curl_multi *multi,
if(!ret) { if(!ret) {
infof(data, "Downgrades to HTTP/1.1!\n"); infof(data, "Downgrades to HTTP/1.1!\n");
connclose(data->conn, "Disconnect HTTP/2 for HTTP/1");
data->state.httpwant = CURL_HTTP_VERSION_1_1; data->state.httpwant = CURL_HTTP_VERSION_1_1;
/* clear the error message bit too as we ignore the one we got */ /* clear the error message bit too as we ignore the one we got */
data->state.errorbuf = FALSE; data->state.errorbuf = FALSE;