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curl_url_set(3) Library Functions Manual curl_url_set(3) NAME curl_url_set - set a URL part SYNOPSIS #include <curl/curl.h> CURLUcode curl_url_set(CURLU *url, CURLUPart part, const char *content, unsigned int flags); DESCRIPTION The url handle to work on, passed in as the first argument, must be a han- dle previously created by curl_url(3) or curl_url_dup(3). This function sets or updates individual URL components, or parts, held by the URL object the handle identifies. The part argument should identify the particular URL part (see list below) to set or change, with content pointing to a null-terminated string with the new contents for that URL part. The contents should be in the form and encoding they would use in a URL: URL encoded. When setting a part in the URL object that was previously already set, it replaces the data that was previously stored for that part with the new content. The caller does not have to keep content around after a successful call as this function copies the content. Setting a part to a NULL pointer removes that part's contents from the CURLU handle. This function has an 8 MB maximum length limit for all provided input strings. In the real world, excessively long fields in URLs cause problems even if this function accepts them. When setting or updating contents of individual URL parts, curl_url_set(3) might accept data that would not be otherwise possible to set in the string when it gets populated as a result of a full URL parse. Beware. If done so, extracting a full URL later on from such components might render an invalid URL. The flags argument is a bitmask with independent features. PARTS CURLUPART_URL Allows the full URL of the handle to be replaced. If the handle al- ready is populated with a URL, the new URL can be relative to the previous. When successfully setting a new URL, relative or absolute, the han- dle contents is replaced with the components of the newly set URL. Pass a pointer to a null-terminated string to the url parameter. The string must point to a correctly formatted "RFC 3986+" URL or be a NULL pointer. The URL parser only understands and parses the subset of URLS that are "hierarchical" and therefore contain a :// separa- tor - not the ones that are normally specified with only a colon separator. By default this API only parses URLs using schemes for protocols that are supported built-in. To make libcurl parse URLs generically even for schemes it does not know about, the CURLU_NON_SUP- PORT_SCHEME flags bit must be set. Otherwise, this function returns CURLUE_UNSUPPORTED_SCHEME for URL schemes it does not recognize. Unless CURLU_NO_AUTHORITY is set, a blank hostname is not allowed in the URL. When a full URL is set (parsed), the hostname component is stored URL decoded. It is considered fine to set a blank URL ("") as a redirect, but not as a normal URL. Therefore, setting a "" URL works fine if the han- dle already holds a URL, otherwise it triggers an error. CURLUPART_SCHEME Scheme cannot be URL decoded on set. libcurl only accepts setting schemes up to 40 bytes long. CURLUPART_USER If only the user part is set and not the password, the URL is repre- sented with a blank password. CURLUPART_PASSWORD If only the password part is set and not the user, the URL is repre- sented with a blank user. CURLUPART_OPTIONS The options field is an optional field that might follow the pass- word in the userinfo part. It is only recognized/used when parsing URLs for the following schemes: pop3, smtp and imap. This function however allows users to independently set this field. CURLUPART_HOST The hostname. If it is International Domain Name (IDN) the string must then be encoded as your locale says or UTF-8 (when WinIDN is used). If it is a bracketed IPv6 numeric address it may contain a zone id (or you can use CURLUPART_ZONEID). Note that if you set an IPv6 address, it gets ruined and causes an error if you also set the CURLU_URLENCODE flag. Unless CURLU_NO_AUTHORITY is set, a blank hostname is not allowed to set. CURLUPART_ZONEID If the hostname is a numeric IPv6 address, this field can also be set. CURLUPART_PORT The port number cannot be URL encoded on set. The given port number is provided as a string and the decimal number in it must be between 0 and 65535. Anything else returns an error. CURLUPART_PATH If a path is set in the URL without a leading slash, a slash is prepended automatically. CURLUPART_QUERY The query part gets spaces converted to pluses when asked to URL en- code on set with the CURLU_URLENCODE bit. If used together with the CURLU_APPENDQUERY bit, the provided part is appended on the end of the existing query. The question mark in the URL is not part of the actual query con- tents. CURLUPART_FRAGMENT The hash sign in the URL is not part of the actual fragment con- tents. FLAGS The flags argument is zero, one or more bits set in a bitmask. CURLU_APPENDQUERY Can be used when setting the CURLUPART_QUERY component. The provided new part is then appended at the end of the existing query - and if the previous part did not end with an ampersand (&), an ampersand gets inserted before the new appended part. When CURLU_APPENDQUERY is used together with CURLU_URLENCODE, the first '=' symbol is not URL encoded. CURLU_NON_SUPPORT_SCHEME If set, allows curl_url_set(3) to set a non-supported scheme. It then of course cannot know if the provided scheme is a valid one or not. CURLU_URLENCODE When set, curl_url_set(3) URL encodes the part on entry, except for scheme, port and URL. When setting the path component with URL encoding enabled, the fol- lowing characters are left as-is if present: ! $ & ' ( ) { } [ ] * + , ; = : @ The query part gets space-to-plus converted before the URL conver- sion is applied. This URL encoding is charset unaware and converts the input in a byte-by-byte manner. CURLU_DEFAULT_SCHEME If set, allows the URL to be set without a scheme and then sets that to the default scheme: HTTPS. Overrides the CURLU_GUESS_SCHEME op- tion if both are set. CURLU_GUESS_SCHEME If set, allows the URL to be set without a scheme and it instead "guesses" which scheme that was intended based on the hostname. If the outermost subdomain name matches DICT, FTP, IMAP, LDAP, POP3 or SMTP then that scheme is used, otherwise it picks HTTP. Conflicts with the CURLU_DEFAULT_SCHEME option which takes precedence if both are set. If guessing is not allowed and there is no default scheme set, try- ing to parse a URL without a scheme returns error. If the scheme ends up set as a result of guessing, i.e. it is not actually present in the parsed URL, it can later be figured out by using the CURLU_NO_GUESS_SCHEME flag when subsequently getting the URL or the scheme with curl_url_get(3). CURLU_NO_AUTHORITY If set, skips authority checks. The RFC allows individual schemes to omit the host part (normally the only mandatory part of the author- ity), but libcurl cannot know whether this is permitted for custom schemes. Specifying the flag permits empty authority sections, simi- lar to how file scheme is handled. CURLU_PATH_AS_IS When set for CURLUPART_URL, this skips the normalization of the path. That is the procedure where libcurl otherwise removes se- quences of dot-slash and dot-dot etc. The same option used for transfers is called CURLOPT_PATH_AS_IS(3). CURLU_ALLOW_SPACE If set, the URL parser allows space (ASCII 32) where possible. The URL syntax does normally not allow spaces anywhere, but they should be encoded as %20 or '+'. When spaces are allowed, they are still not allowed in the scheme. When space is used and allowed in a URL, it is stored as-is unless CURLU_URLENCODE is also set, which then makes libcurl URL encode the space before stored. This affects how the URL is constructed when curl_url_get(3) is subsequently used to extract the full URL or individual parts. (Added in 7.78.0) CURLU_DISALLOW_USER If set, the URL parser does not accept embedded credentials for the CURLUPART_URL, and instead returns CURLUE_USER_NOT_ALLOWED for such URLs. PROTOCOLS This functionality affects all supported protocols EXAMPLE int main(void) { CURLUcode rc; CURLU *url = curl_url(); rc = curl_url_set(url, CURLUPART_URL, "https://example.com", 0); if(!rc) { /* change it to an FTP URL */ rc = curl_url_set(url, CURLUPART_SCHEME, "ftp", 0); } curl_url_cleanup(url); } AVAILABILITY Added in curl 7.62.0 RETURN VALUE Returns a CURLUcode error value, which is CURLUE_OK (0) if everything went fine. See the libcurl-errors(3) man page for the full list with descrip- tions. The input string passed to curl_url_set(3) must be shorter than eight mil- lion bytes. Otherwise this function returns CURLUE_MALFORMED_INPUT. If this function returns an error, no URL part is set. SEE ALSO CURLOPT_CURLU(3), curl_url(3), curl_url_cleanup(3), curl_url_dup(3), curl_url_get(3), curl_url_strerror(3) libcurl 2026-06-11 curl_url_set(3)
NAME | SYNOPSIS | DESCRIPTION | PARTS | FLAGS | PROTOCOLS | EXAMPLE | AVAILABILITY | RETURN VALUE | SEE ALSO
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