HttpOpenRequestHttpOpenRequest*
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HttpOpenRequest

HINTERNET HttpOpenRequest(
    IN HINTERNET hHttpSession,
    IN LPCSTR lpszVerb,
    IN LPCSTR lpszObjectName,
    IN LPCSTR lpszVersion,
    IN LPCSTR lpszReferer,
    IN LPCSTR FAR * lpszAcceptTypes,
    IN DWORD dwFlags,
    IN DWORD dwContext
);

Opens an HTTP request handle.

hHttpSession
Handle to an HTTP session returned by InternetConnect.
lpszVerb
Address of a string that contains the verb to use in the request. If this parameter is NULL, the function uses "GET" as the verb.
lpszObjectName
Address of a string that contains the name of the target object of the specified verb. This is generally a file name, an executable module, or a search specifier.
lpszVersion
Address of a string that contains the HTTP version. If this parameter is NULL, the function uses "HTTP/1.0" as the version.
lpszReferer
Address of a string that specifies the address (URL) of the document from which the URL in the request (lpszObjectName) was obtained. If this parameter is NULL, no "referrer" is specified.
lpszAcceptTypes
Address of a null-terminated array of LPCSTR pointers indicating content types accepted by the client. If this parameter is NULL, no types are accepted by the client. Servers interpret a lack of accept types to indicate that the client accepts only documents of type "text/*" (that is, only text documents, and not pictures or other binary files).
dwFlags
Internet flag values. Can be any of the following values:
INTERNET_FLAG_CACHE_IF_NET_FAIL
Return the resource from the cache if the network request for the resource fails due to an ERROR_INTERNET_CONNECTION_RESET or ERROR_INTERNET_CANNOT_CONNECT.
INTERNET_FLAG_DONT_CACHE
Does not add the returned entity to the cache. Identical to the preferred value, INTERNET_FLAG_NO_CACHE_WRITE.
INTERNET_FLAG_HYPERLINK
Forces a reload if there was no Expires time and no Last-Modified time returned from the server when determining whether to reload the item from the network.
INTERNET_FLAG_IGNORE_CERT_CN_INVALID
Disables Win32 Internet function checking of SSL/PCT-based certificates that are returned from the server against the host name given in the request. Win32 Internet functions use a simple check against certificates by comparing for matching host names and simple wildcarding rules.
INTERNET_FLAG_IGNORE_CERT_DATE_INVALID
Disables Win32 Internet function checking of SSL/PCT-based certificates for proper validity dates.
INTERNET_FLAG_IGNORE_REDIRECT_TO_HTTP
Disables the ability of the Win32 Internet functions to detect this special type of redirect. When this flag is used, Win32 Internet functions transparently allow redirects from HTTPS to HTTP URLs.
INTERNET_FLAG_IGNORE_REDIRECT_TO_HTTPS
Disables the ability of the Win32 Internet functions to detect this special type of redirect. When this flag is used, Win32 Internet functions transparently allow redirects from HTTP to HTTPS URLs.
INTERNET_FLAG_KEEP_CONNECTION
Uses keep-alive semantics, if available, for the connection. This flag is required for Microsoft Network (MSN), NT LAN Manager (NTLM), and other types of authentication.
INTERNET_FLAG_MAKE_PERSISTENT
No longer supported.
INTERNET_FLAG_MUST_CACHE_REQUEST
Causes a temporary file to be created if the file cannot be cached. Identical to the preferred value, INTERNET_FLAG_NEED_FILE.
INTERNET_FLAG_NEED_FILE
Causes a temporary file to be created if the file cannot be cached.
INTERNET_FLAG_NO_AUTH
Does not attempt authentication automatically.
INTERNET_FLAG_NO_AUTO_REDIRECT
Does not automatically handle redirection in HttpSendRequest.
INTERNET_FLAG_NO_CACHE_WRITE
Does not add the returned entity to the cache.
INTERNET_FLAG_NO_COOKIES
Does not automatically add cookie headers to requests, and does not automatically add returned cookies to the cookie database.
INTERNET_FLAG_NO_UI
Disables the cookie dialog box.
INTERNET_FLAG_PRAGMA_NOCACHE
Forces the request to be resolved by the origin server, even if a cached copy exists on the proxy.
INTERNET_FLAG_READ_PREFETCH
This flag is currently disabled.
INTERNET_FLAG_RELOAD
Forces a download of the requested file, object, or directory listing from the origin server, not from the cache.
INTERNET_FLAG_RESYNCHRONIZE
Reloads HTTP resources if the resource has been modified since the last time it was downloaded.
INTERNET_FLAG_SECURE
Uses SSL/PCT transaction semantics.
dwContext
Application-defined value that associates this operation with any application data.

HttpOpenRequest creates a new HTTP request handle and stores the specified parameters in that handle. An HTTP request handle holds a request to be sent to an HTTP server and contains all RFC822/MIME/HTTP headers to be sent as part of the request.

Use the InternetCloseHandle function to close the handle returned by HttpOpenRequest. InternetCloseHandle cancels all outstanding I/O on the handle.

The lpszReferer parameter to InternetOpen is used as the referrer for the HTTP request.

See also HttpAddRequestHeaders, HttpQueryInfo, InternetReadFile

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