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+---
+c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_PROXY_CAINFO_BLOB
+Section: 3
+Source: libcurl
+See-also:
+  - CURLOPT_CAINFO (3)
+  - CURLOPT_CAINFO_BLOB (3)
+  - CURLOPT_CAPATH (3)
+  - CURLOPT_PROXY_CAINFO (3)
+  - CURLOPT_PROXY_CAPATH (3)
+  - CURLOPT_PROXY_SSL_VERIFYHOST (3)
+  - CURLOPT_PROXY_SSL_VERIFYPEER (3)
+  - CURLOPT_SSL_VERIFYHOST (3)
+  - CURLOPT_SSL_VERIFYPEER (3)
+---
+
+# NAME
+
+CURLOPT_PROXY_CAINFO_BLOB - proxy Certificate Authority (CA) bundle in PEM format
+
+# SYNOPSIS
+
+~~~c
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_CAINFO_BLOB,
+                          struct curl_blob *stblob);
+~~~
+
+# DESCRIPTION
+
+This option is for connecting to an HTTPS proxy, not an HTTPS server.
+
+Pass a pointer to a curl_blob structure, which contains information (pointer
+and size) about a memory block with binary data of PEM encoded content holding
+one or more certificates to verify the HTTPS proxy with.
+
+If the blob is initialized with the flags member of struct curl_blob set to
+CURL_BLOB_COPY, the application does not have to keep the buffer around after
+setting this.
+
+If CURLOPT_PROXY_SSL_VERIFYPEER(3) is zero and you avoid verifying the
+server's certificate, CURLOPT_PROXY_CAINFO_BLOB(3) is not needed.
+
+This option overrides CURLOPT_PROXY_CAINFO(3).
+
+# DEFAULT
+
+NULL
+
+# PROTOCOLS
+
+Used with HTTPS proxy
+
+# EXAMPLE
+
+~~~c
+#include <string.h> /* for strlen */
+
+extern char *strpem; /* strpem must point to a PEM string */
+int main(void)
+{
+  CURL *curl = curl_easy_init();
+  if(curl) {
+    CURLcode res;
+    struct curl_blob blob;
+    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
+    /* using an HTTPS proxy */
+    curl_easy_setopt(curl, CURLOPT_PROXY, "https://localhost:443");
+    blob.data = strpem;
+    blob.len = strlen(strpem);
+    blob.flags = CURL_BLOB_COPY;
+    curl_easy_setopt(curl, CURLOPT_PROXY_CAINFO_BLOB, &blob);
+    res = curl_easy_perform(curl);
+    curl_easy_cleanup(curl);
+  }
+}
+~~~
+
+# AVAILABILITY
+
+Added in 7.77.0.
+
+This option is supported by the rustls (since 7.82.0), OpenSSL, Secure
+Transport and Schannel backends.
+
+# RETURN VALUE
+
+Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
+CURLE_OUT_OF_MEMORY if there was insufficient heap space.