OSSL_HTTP_adapt_proxy, OSSL_parse_url, OSSL_HTTP_parse_url, OCSP_parse_url - http utility functions

       Copyright 2019-2022 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the Apache License 2.0 (the "License").  You may not use this file except in compliance
       with the License.  You can obtain a copy in the file LICENSE in the source distribution or at
       <https://www.openssl.org/source/license.html>.

3.5.0                                              2025-06-04                          OSSL_HTTP_PARSE_URL(3SSL)

OSSL_HTTP_adapt_proxy() takes an optional proxy hostname proxy and returns it transformed according to
       the optional no_proxy parameter, server, use_ssl, and the applicable environment variable, as follows.
       If proxy is NULL, take any default value from the "http_proxy" environment variable, or from
       "https_proxy" if use_ssl is nonzero.  If this still does not yield a proxy hostname, take any further
       default value from the "HTTP_PROXY" environment variable, or from "HTTPS_PROXY" if use_ssl is nonzero.
       If no_proxy is NULL, take any default exclusion value from the "no_proxy" environment variable, or else
       from "NO_PROXY".  Return the determined proxy host unless the exclusion value, which is a list of proxy
       hosts separated by "," and/or whitespace, contains server.  Otherwise return NULL.  When server is a
       string delimited by "[" and "]", which are used for IPv6 addresses, the enclosing "[" and "]" are
       stripped prior to comparison.

       OSSL_parse_url() parses its input string url as a URL of the form
       "[scheme://][userinfo@]host[:port][/path][?query][#fragment]" and splits it up into scheme, userinfo,
       host, port, path, query, and fragment components.  The host (or server) component may be a DNS name or an
       IP address where IPv6 addresses must be enclosed in square brackets "[" and "]".  The port component is
       optional and defaults to 0.  If given, it must be in decimal form.  If the pport_num argument is not NULL
       the integer value of the port number is assigned to *pport_num on success.  The path component is also
       optional and defaults to "/".  Each non-NULL result pointer argument pscheme, puser, phost, pport, ppath,
       pquery, and pfrag, is assigned the respective url component.  Any IPv6 address in *phost is enclosed in
       "[" and "]".  On success, they are guaranteed to contain non-NULL string pointers, else NULL.  It is the
       responsibility of the caller to free them using OPENSSL_free(3).  If pquery is NULL, any given query
       component is handled as part of the path.  A string returned via *ppath is guaranteed to begin with a "/"
       character.  For absent scheme, userinfo, port, query, and fragment components an empty string is
       provided.

       OSSL_HTTP_parse_url() is a special form of OSSL_parse_url() where the scheme, if given, must be "http" or
       "https".  If pssl is not NULL, *pssl is assigned 1 in case parsing was successful and the scheme is
       "https", else 0.  The port component is optional and defaults to 443 if the scheme is "https", else 80.
       Note that relative paths must be given with a leading "/", otherwise the first path element is
       interpreted as the host.

       Calling the deprecated function OCSP_parse_url(url, host, port, path, ssl) is equivalent to
       OSSL_HTTP_parse_url(url, ssl, NULL, host, port, NULL, path, NULL, NULL).

OSSL_HTTP_adapt_proxy(), OSSL_parse_url() and OSSL_HTTP_parse_url() were added in OpenSSL 3.0.
       OCSP_parse_url() was deprecated in OpenSSL 3.0.

       OSSL_HTTP_adapt_proxy, OSSL_parse_url, OSSL_HTTP_parse_url, OCSP_parse_url - http utility functions

OSSL_HTTP_adapt_proxy() returns NULL if no proxy is to be used, otherwise a constant proxy hostname
       string, which is either the proxy name handed in or an environment variable value.

       OSSL_parse_url(), OSSL_HTTP_parse_url(), and OCSP_parse_url() return 1 on success, 0 on error.

OSSL_HTTP_transfer(3)

        #include <openssl/http.h>

        const char *OSSL_HTTP_adapt_proxy(const char *proxy, const char *no_proxy,
                                          const char *server, int use_ssl);

        int OSSL_parse_url(const char *url, char **pscheme, char **puser, char **phost,
                           char **pport, int *pport_num,
                           char **ppath, char **pquery, char **pfrag);
        int OSSL_HTTP_parse_url(const char *url,
                                int *pssl, char **puser, char **phost,
                                char **pport, int *pport_num,
                                char **ppath, char **pquery, char **pfrag);

       The following functions have been deprecated since OpenSSL 3.0, and can be hidden entirely by defining
       OPENSSL_API_COMPAT with a suitable version value, see openssl_user_macros(7):

        int OCSP_parse_url(const char *url, char **phost, char **pport, char **ppath,
                           int *pssl);