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deps/curl/docs/libcurl/opts/CURLOPT_STREAM_DEPENDS_E.md

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+---
+c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_STREAM_DEPENDS_E
+Section: 3
+Source: libcurl
+See-also:
+  - CURLMOPT_PIPELINING (3)
+  - CURLOPT_HTTP_VERSION (3)
+  - CURLOPT_STREAM_DEPENDS (3)
+  - CURLOPT_STREAM_WEIGHT (3)
+---
+
+# NAME
+
+CURLOPT_STREAM_DEPENDS_E - stream this transfer depends on exclusively
+
+# SYNOPSIS
+
+~~~c
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_STREAM_DEPENDS_E,
+                          CURL *dephandle);
+~~~
+
+# DESCRIPTION
+
+Pass a CURL pointer in *dephandle* to identify the stream within the same
+connection that this stream is depending upon exclusively. That means it
+depends on it and sets the Exclusive bit.
+
+The spec says "Including a dependency expresses a preference to allocate
+resources to the identified stream rather than to the dependent stream."
+
+Setting a dependency with the exclusive flag for a reprioritized stream causes
+all the dependencies of the new parent stream to become dependent on the
+reprioritized stream.
+
+This option can be set during transfer.
+
+*dephandle* must not be the same as *handle*, that makes this function return
+an error. It must be another easy handle, and it also needs to be a handle of
+a transfer that is about to be sent over the same HTTP/2 connection for this
+option to have an actual effect.
+
+# DEFAULT
+
+NULL
+
+# PROTOCOLS
+
+HTTP/2
+
+# EXAMPLE
+
+~~~c
+int main(void)
+{
+  CURL *curl = curl_easy_init();
+  CURL *curl2 = curl_easy_init(); /* a second handle */
+  if(curl) {
+    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/one");
+
+    /* the second depends on the first */
+    curl_easy_setopt(curl2, CURLOPT_URL, "https://example.com/two");
+    curl_easy_setopt(curl2, CURLOPT_STREAM_DEPENDS_E, curl);
+
+    /* then add both to a multi handle and transfer them! */
+  }
+}
+~~~
+
+# AVAILABILITY
+
+Added in 7.46.0
+
+# RETURN VALUE
+
+Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.