HttpAddRequestHeadersHttpAddRequestHeaders*
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HttpAddRequestHeaders

BOOL HttpAddRequestHeaders(
    IN HINTERNET hHttpRequest,
    IN LPCSTR lpszHeaders,
    IN DWORD dwHeadersLength,
    IN DWORD dwModifiers
);

Adds one or more HTTP request headers to the HTTP request handle.

hHttpRequest
Open HTTP request handle returned by HttpOpenRequest.
lpszHeaders
Headers to append to the request. Each header must be terminated by a CR/LF (carriage return/line feed) pair.
dwHeadersLength
Length, in characters, of lpszHeaders. If this parameter is -1L, the function assumes that lpszHeaders is zero-terminated (ASCIIZ), and the length is computed.
dwModifiers
Values used to modify the semantics of this function. Can be a combination of the following values:
HTTP_ADDREQ_FLAG_ADD
Adds the header if it does not exist. Used with HTTP_ADDREQ_FLAG_REPLACE.
HTTP_ADDREQ_FLAG_ADD_IF_NEW
Adds the header only if it does not already exist; otherwise, an error is returned.
HTTP_ADDREQ_FLAG_COALESCE
Coalesces headers of the same name.
HTTP_ADDREQ_FLAG_COALESCE_WITH_COMMA
Coalesces headers of the same name. For example, adding "Accept: text/*" followed by "Accept: audio/*" with this flag results in the formation of the single header "Accept: text/*, audio/*". This causes the first header found to be coalesced. It is up to the calling application to ensure a cohesive scheme with respect to coalesced/separate headers.
HTTP_ADDREQ_FLAG_COALESCE_WITH_SEMICOLON
Coalesces headers of the same name using a semicolon.
HTTP_ADDREQ_FLAG_REPLACE
Replaces or removes a header. If the header value is empty and the header is found, it is removed. If not empty, the header value is replaced.

HttpAddRequestHeaders appends additional, free-format headers to the HTTP request handle and is intended for use by sophisticated clients that need detailed control over the exact request sent to the HTTP server.

Note that for basic HttpAddRequestHeaders, the application can pass in multiple headers in a single buffer. If the application is trying to remove or replace a header, only one header can be supplied in lpszHeaders.

See also HttpSendRequest

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