scheme://host/path/# and sc

From the manual for <a href="https://curl.se/libcurl/c/curl_url_get.html" rel="nofollo

Please support zero-sized fragment and query about trurl HOT 9 OPEN

lu-zero commented on May 28, 2024

Please support zero-sized fragment and query

from trurl.

Comments (9)

emanuele6 commented on May 28, 2024

I think this is a limitation of libcurl's urlapi

from trurl.

lu-zero commented on May 28, 2024

From the manual for curl_url_get:

CURLUPART_QUERY

The initial question mark that denotes the beginning of the query part is a delimiter only. It is not part of the query contents.

A not-present query will lead part to be set to NULL. A zero-length query will lead part to be set to a zero-length string.

The query part will also get pluses converted to space when asked to URL decode on get with the CURLU_URLDECODE bit.

from trurl.

emanuele6 commented on May 28, 2024

I was mainly referring to it normalising scheme://host/path/? as scheme://host/path/ even though it can distinguish no query and empty query. But yeah, also note that it can only do that for queries, not fragments.

$ ./foo 'scheme://host/path/'
in:     scheme://host/path/
out:    scheme://host/path/
query:  NULL
frag:   NULL
$ ./foo 'scheme://host/path/?'
in:     scheme://host/path/?
out:    scheme://host/path/
query:
frag:   NULL
$ ./foo 'scheme://host/path/#'
in:     scheme://host/path/#
out:    scheme://host/path/
query:  NULL
frag:   NULL
$ ./foo 'scheme://host/path/?#'
in:     scheme://host/path/?#
out:    scheme://host/path/
query:
frag:   NULL
$ ./foo 'scheme://host/path/?#hello'
in:     scheme://host/path/?#hello
out:    scheme://host/path/#hello
query:
frag:   hello
$ ./foo 'scheme://host/path/?hello#'
in:     scheme://host/path/?hello#
out:    scheme://host/path/?hello
query:  hello
frag:   NULL

libcurl always normalises empty query/fragment as no query/fragment; and it does not provide a way to distinguish empty fragment from no fragment.

#include <curl/curl.h>

int main(int const argc, char const *const argv[])
{
    if (argc != 2)
        return 1;

    CURLU *const uh = curl_url();
    curl_url_set(uh, CURLUPART_URL, argv[1],
                 CURLU_NON_SUPPORT_SCHEME|
                 CURLU_GUESS_SCHEME|
                 CURLU_URLENCODE);
    char *url;
    curl_url_get(uh, CURLUPART_URL, &url, CURLU_DEFAULT_PORT);
    char *query;
    curl_url_get(uh, CURLUPART_QUERY, &query, CURLU_DEFAULT_PORT);
    char *frag;
    curl_url_get(uh, CURLUPART_FRAGMENT, &frag, CURLU_DEFAULT_PORT);
    printf("in:\t%s\n"
           "out:\t%s\n"
           "query:\t%s\n"
           "frag:\t%s\n",
           argv[1], url, query ? query : "NULL", frag ? frag : "NULL");
    curl_free(url);
    curl_free(query);
    curl_free(frag);
    curl_url_cleanup(uh);
    return 0;
}