IHttpResponse::SetStatus Method

Sets the HTTP status for the response.


virtual HRESULT SetStatus(  
   IN USHORT statusCode,  
   IN PCSTR pszReason,  
   IN USHORT uSubStatus = 0,  
   IN HRESULT hrErrorToReport = S_OK,  
   IN INativeSectionException* pException = NULL  
) = 0;  


[IN] The HTTP status code to set.

[IN] A pointer to a string that contains the HTTP status text to set.

[IN] The optional HTTP substatus code to set.

[IN] The optional Win32 error associated with the response status code.

[IN] A pointer to an optional INativeSectionException interface.

Return Value

An HRESULT. Possible values include, but are not limited to, those in the following table.

Value Description
S_OK Indicates that the operation was successful.
ERROR_INVALID_DATA Indicates that the data is not valid (for example, the data in the status text is too long).
ERROR_NOT_ENOUGH_MEMORY Indicates that there is insufficient memory to perform the operation.


The SetStatus method configures the HTTP response status, which consists of the status code, the substatus code, the status text, a Win32 error (if one exists) associated with the response, and an optional INativeSectionException interface.


The following code example demonstrates how to use the GetStatus method to create an HTTP module that retrieves the HTTP response status. The example module returns the contents of the HTTP response status to the client and then calls the SetStatus method to set the response status to "200 OK" so the client will always receive the result.

#define _WINSOCKAPI_
#include <windows.h>
#include <sal.h>
#include <httpserv.h>

// Create the module class.
class MyHttpModule : public CHttpModule
        IN IHttpContext * pHttpContext,
        IN IHttpEventProvider * pProvider
        UNREFERENCED_PARAMETER( pProvider );

        // Create buffers for the HTTP status fields.
        USHORT uStatusCode;
        USHORT uSubStatus;
        PCSTR  pszReason;
        USHORT chReason;
        PCWSTR pszModule;
        DWORD  pdwNotification;

        // Create an HRESULT to receive return values from methods.
        HRESULT hr;

        // Retrieve a pointer to the response.
        IHttpResponse * pHttpResponse = pHttpContext->GetResponse();

        // Test for an error.
        if (pHttpResponse != NULL)
            // Retrieve the current HTTP status.

            // Test for an error.
            if (NULL != pszReason)
                // Clear the existing response.
                // Set the MIME type to plain text.
                // Create a buffer for the return message.
                char szBuffer[256];

                // Format the HTTP status.
                sprintf_s(szBuffer,255,"%u.%u %s",
                // Return the status to the client.
                    "HTTP Status: ",szBuffer);

                // Set the HTTP status code.
                uStatusCode = 200;
                // Set the HTTP substatus code.
                uSubStatus = 0;
                // Set the HTTP status message.
                // Set the HTTP status.
                hr = pHttpResponse->SetStatus(uStatusCode,
                // Test for an error.
                if (FAILED(hr))
                    // Set the error status.
                    pProvider->SetErrorStatus( hr );

                // End additional processing.
                return RQ_NOTIFICATION_FINISH_REQUEST;

        // Return processing to the pipeline.


    // Create a utility method that inserts a name/value pair into the response.
    HRESULT WriteResponseMessage(
        IHttpContext * pHttpContext,
        PCSTR pszName,
        PCSTR pszValue
        // Create an HRESULT to receive return values from methods.
        HRESULT hr;
        // Create a data chunk.
        HTTP_DATA_CHUNK dataChunk;
        // Set the chunk to a chunk in memory.
        dataChunk.DataChunkType = HttpDataChunkFromMemory;
        // Buffer for bytes written of data chunk.
        DWORD cbSent;

        // Set the chunk to the first buffer.
        dataChunk.FromMemory.pBuffer =
            (PVOID) pszName;
        // Set the chunk size to the first buffer size.
        dataChunk.FromMemory.BufferLength =
            (USHORT) strlen(pszName);
        // Insert the data chunk into the response.
        hr = pHttpContext->GetResponse()->WriteEntityChunks(
        // Test for an error.
        if (FAILED(hr))
            // Return the error status.
            return hr;

        // Set the chunk to the second buffer.
        dataChunk.FromMemory.pBuffer =
            (PVOID) pszValue;
        // Set the chunk size to the second buffer size.
        dataChunk.FromMemory.BufferLength =
            (USHORT) strlen(pszValue);
        // Insert the data chunk into the response.
        hr = pHttpContext->GetResponse()->WriteEntityChunks(
        // Test for an error.
        if (FAILED(hr))
            // Return the error status.
            return hr;

        // Return a success status.
        return S_OK;

// Create the module's class factory.
class MyHttpModuleFactory : public IHttpModuleFactory
        OUT CHttpModule ** ppModule, 
        IN IModuleAllocator * pAllocator
        UNREFERENCED_PARAMETER( pAllocator );

        // Create a new instance.
        MyHttpModule * pModule = new MyHttpModule;

        // Test for an error.
        if (!pModule)
            // Return an error if the factory cannot create the instance.
            // Return a pointer to the module.
            *ppModule = pModule;
            pModule = NULL;
            // Return a success status.
            return S_OK;

    void Terminate()
        // Remove the class from memory.
        delete this;

// Create the module's exported registration function.
    DWORD dwServerVersion,
    IHttpModuleRegistrationInfo * pModuleInfo,
    IHttpServer * pGlobalInfo
    UNREFERENCED_PARAMETER( dwServerVersion );

    // Set the request notifications and exit.
    return pModuleInfo->SetRequestNotifications(
        new MyHttpModuleFactory,

Your module must export the RegisterModule function. You can export this function by creating a module definition (.def) file for your project, or you can compile the module by using the /EXPORT:RegisterModule switch. For more information, see Walkthrough: Creating a Request-Level HTTP Module By Using Native Code.

You can optionally compile the code by using the __stdcall (/Gz) calling convention instead of explicitly declaring the calling convention for each function.


Type Description
Client - IIS 7.0 on Windows Vista
- IIS 7.5 on Windows 7
- IIS 8.0 on Windows 8
- IIS 10.0 on Windows 10
Server - IIS 7.0 on Windows Server 2008
- IIS 7.5 on Windows Server 2008 R2
- IIS 8.0 on Windows Server 2012
- IIS 8.5 on Windows Server 2012 R2
- IIS 10.0 on Windows Server 2016
Product - IIS 7.0, IIS 7.5, IIS 8.0, IIS 8.5, IIS 10.0
- IIS Express 7.5, IIS Express 8.0, IIS Express 10.0
Header Httpserv.h

See Also

IHttpResponse Interface
IHttpResponse::GetStatus Method