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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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4
lib/http2.h
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@ -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 */