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Upon HTTP_1_1_REQUIRED, retry the request with HTTP/1.1

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This is a companion patch to cbea2fd2c (NTLM: force the connection to
HTTP/1.1, 2018-12-06): with NTLM, we can switch to HTTP/1.1
preemptively. However, with other (Negotiate) authentication it is not
clear to this developer whether there is a way to make it work with
HTTP/2, so let's try HTTP/2 first and fall back in case we encounter the
error HTTP_1_1_REQUIRED.

Note: we will still keep the NTLM workaround, as it avoids an extra
round trip.

Daniel Stenberg helped a lot with this patch, in particular by
suggesting to introduce the Curl_h2_http_1_1_error() function.

Closes #3349

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
This commit is contained in:
Johannes Schindelin 2018-12-07 17:04:39 +01:00 committed by Daniel Stenberg
parent 07e61abdac
commit d997aa0e96
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3 changed files with 32 additions and 0 deletions
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8
lib/http2.c
View File

@ -2367,6 +2367,14 @@ void Curl_http2_cleanup_dependencies(struct Curl_easy *data)
Curl_http2_remove_child(data->set.stream_depends_on, data);
}
/* Only call this function for a transfer that already got a HTTP/2
CURLE_HTTP2_STREAM error! */
bool Curl_h2_http_1_1_error(struct connectdata *conn)
{
struct http_conn *httpc = &conn->proto.httpc;
return (httpc->error_code == NGHTTP2_HTTP_1_1_REQUIRED);
}
#else /* !USE_NGHTTP2 */
/* Satisfy external references even if http2 is not compiled in. */

4
lib/http2.h
View File

@ -59,6 +59,9 @@ CURLcode Curl_http2_add_child(struct Curl_easy *parent,
void Curl_http2_remove_child(struct Curl_easy *parent,
struct Curl_easy *child);
void Curl_http2_cleanup_dependencies(struct Curl_easy *data);
/* returns true if the HTTP/2 stream error was HTTP_1_1_REQUIRED */
bool Curl_h2_http_1_1_error(struct connectdata *conn);
#else /* USE_NGHTTP2 */
#define Curl_http2_init(x) CURLE_UNSUPPORTED_PROTOCOL
#define Curl_http2_send_request(x) CURLE_UNSUPPORTED_PROTOCOL
@ -74,6 +77,7 @@ void Curl_http2_cleanup_dependencies(struct Curl_easy *data);
#define Curl_http2_add_child(x, y, z)
#define Curl_http2_remove_child(x, y)
#define Curl_http2_cleanup_dependencies(x)
#define Curl_h2_http_1_1_error(x) 0
#endif
#endif /* HEADER_CURL_HTTP2_H */

20
lib/multi.c
View File

@ -46,6 +46,7 @@
#include "vtls/vtls.h"
#include "connect.h"
#include "http_proxy.h"
#include "http2.h"
/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
@ -1955,6 +1956,25 @@ static CURLMcode multi_runsingle(struct Curl_multi *multi,
done = TRUE;
}
}
else if((CURLE_HTTP2_STREAM == result) &&
Curl_h2_http_1_1_error(data->easy_conn)) {
CURLcode ret = Curl_retry_request(data->easy_conn, &newurl);
infof(data, "Forcing HTTP/1.1 for NTLM");
data->set.httpversion = CURL_HTTP_VERSION_1_1;
if(!ret)
retry = (newurl)?TRUE:FALSE;
else
result = ret;
if(retry) {
/* if we are to retry, set the result to OK and consider the
request as done */
result = CURLE_OK;
done = TRUE;
}
}
if(result) {
/*