Windows httpapi server example.

server.c

// https://learn.microsoft.com/zh-cn/windows/win32/Http
// gcc server.c -Os -Wall -lhttpapi -o server

#define WIN32_LEAN_AND_MEAN

#include <stdio.h>
#include <stdlib.h>
#include <http.h>
#include <windows.h>
#include <signal.h>


static HANDLE hReqQueue;
static HTTP_SERVER_SESSION_ID serverSessionId;
static HTTP_URL_GROUP_ID urlGroupId;

static void cleanup(int) {
    HttpCloseRequestQueue(hReqQueue);
    hReqQueue = NULL; // notify receive loop
    HttpCloseUrlGroup(urlGroupId);
    HttpCloseServerSession(serverSessionId);
    HttpTerminate(HTTP_INITIALIZE_SERVER, NULL);
    puts("Server terminated");
}

int main() {
    ULONG ret;

    // Initialize HTTP Server API
    ret = HttpInitialize((HTTPAPI_VERSION)HTTPAPI_VERSION_2, HTTP_INITIALIZE_SERVER, NULL);
    if (ret != NO_ERROR) {
        printf("HttpInitialize failed with %lu\n", ret);
        return ret;
    }

    // Create HTTP Server Session
    ret = HttpCreateServerSession((HTTPAPI_VERSION)HTTPAPI_VERSION_2, &serverSessionId, 0);
    if (ret != NO_ERROR) {
        printf("HttpCreateServerSession failed with %lu\n", ret);
        return ret;
    }

    // Create URL Group
    ret = HttpCreateUrlGroup(serverSessionId, &urlGroupId, 0);
    if (ret != NO_ERROR) {
        printf("HttpCreateUrlGroup failed with %lu\n", ret);
        return ret;
    }

    // Create Request Queue
    ret = HttpCreateRequestQueue((HTTPAPI_VERSION)HTTPAPI_VERSION_2, NULL, NULL, 0, &hReqQueue);
    if (ret != NO_ERROR) {
        printf("HttpCreateRequestQueue failed with %lu\n", ret);
        return ret;
    }

    // Bind URL Group to Request Queue
    HTTP_BINDING_INFO bindingInfo = {
        .Flags.Present = 1,
        .RequestQueueHandle = hReqQueue
    };
    ret = HttpSetUrlGroupProperty(urlGroupId, HttpServerBindingProperty, &bindingInfo, sizeof(bindingInfo));
    if (ret != NO_ERROR) {
        printf("HttpSetUrlGroupProperty failed with %lu\n", ret);
        return ret;
    }

    // Set URL
    ret = HttpAddUrlToUrlGroup(urlGroupId, L"http://localhost:8080/", 0, 0);
    if (ret != NO_ERROR) {
        printf("HttpAddUrlToUrlGroup failed with %lu\n", ret);
        return ret;
    }

    signal(SIGINT, cleanup);
    puts("Server started on http://localhost:8080");

    // Main loop to handle requests
    while (1) {
        if (!hReqQueue) return 0; // cleaned in SIGINT

        // Initialize request structure
        #define requestBufferLength (sizeof(HTTP_REQUEST) + 1024)
        char requestBuffer[requestBufferLength] = {0};
        HTTP_REQUEST *request = (HTTP_REQUEST*) requestBuffer;

        // Receive a request
        DWORD bytesRead;
        ret = HttpReceiveHttpRequest(hReqQueue, HTTP_NULL_ID, 0, request, requestBufferLength, &bytesRead, NULL);
        if (ret != NO_ERROR) {
            printf("HttpReceiveHttpRequest failed with %lu\n", ret);
            continue;
        }

        // Log remote addr
        PSOCKADDR_IN r = (PSOCKADDR_IN)request->Address.pRemoteAddress;
        #define SIN_ADDR_B(s) (s->sin_addr.S_un.S_un_b)
        printf("Received from %hhu.%hhu.%hhu.%hhu:%hu\n",
            SIN_ADDR_B(r).s_b1, SIN_ADDR_B(r).s_b2, SIN_ADDR_B(r).s_b3, SIN_ADDR_B(r).s_b4, r->sin_port);

        // Initialize the response
        HTTP_RESPONSE response = {
            .StatusCode = 200,
            .pReason = "OK",
        };
        response.ReasonLength = (USHORT)strlen(response.pReason);
        response.Headers.KnownHeaders[HttpHeaderContentType].pRawValue = "text/plain";
        response.Headers.KnownHeaders[HttpHeaderContentType].RawValueLength = (USHORT)strlen(response.Headers.KnownHeaders[HttpHeaderContentType].pRawValue);

        // Response body
        const char* responseBody = "Hello, World!";
        HTTP_DATA_CHUNK dataChunk = {
            .DataChunkType = HttpDataChunkFromMemory,
            .FromMemory = {
                .pBuffer = (PVOID)responseBody,
                .BufferLength = (ULONG)strlen(responseBody)
            }
        };
        response.EntityChunkCount = 1;
        response.pEntityChunks = &dataChunk;

        // Send the response
        DWORD bytesSent;
        ret = HttpSendHttpResponse(hReqQueue, request->RequestId, HTTP_SEND_RESPONSE_FLAG_BUFFER_DATA, &response, NULL, &bytesSent, NULL, 0, NULL, NULL);
        if (ret != NO_ERROR) {
            printf("HttpSendHttpResponse failed with %lu\n", ret);
        }
    }
}

Unfinished pyx binding with some notes:

HTTP_REQUEST_V2“继承”了HTTP_REQUEST_V1。Vista后HTTP_REQUEST就是V2

# distutils: libraries=httpapi
# distutils: define_macros=WIN32_LEAN_AND_MEAN

# TODO：HTTP_SERVER_SESSION_ID定义错了，是ULONGLONG，不是struct

cdef extern from "<windows.h>":
    ctypedef unsigned short USHORT
    ctypedef unsigned long ULONG
    ctypedef unsigned long long ULONGLONG
    ctypedef void* PVOID
    ctypedef PVOID HANDLE
    ctypedef HANDLE* PHANDLE
    ctypedef Py_UNICODE WCHAR
    ctypedef const WCHAR* PCWSTR


cdef extern from "<http.h>":
    ctypedef struct HTTPAPI_VERSION:
        USHORT HttpApiMajorVersion
        USHORT HttpApiMinorVersion
    cdef HTTPAPI_VERSION HTTPAPI_VERSION_2

    ctypedef enum HTTP_SERVER_PROPERTY: # 一种多态，本enum指定选项类型，用给 队列、会话、URL组 设置属性
        HttpServerBindingProperty # HTTP_BINDING_INFO 仅用于把队列绑给URL组
        HttpServerTimeoutsProperty # HTTP_TIMEOUT_LIMIT_INFO 多个部分的超时配置，默认120秒。用于会话和URL组
        HttpServerLoggingProperty # HTTP_LOGGING_INFO 默认无日志。用于会话和URL组
        HttpServerQueueLengthProperty # ULONG 默认100，用于队列
        HttpServer503VerbosityProperty # HTTP_503_RESPONSE_VERBOSITY 队列满了应该怎么响应。默认重置，可选发送503后关闭，可选包含详细信息


    cdef ULONG HTTP_INITIALIZE_SERVER # Flags
    cdef ULONG NO_ERROR, ERROR_INVALID_PARAMETER # 返回值
    ULONG HttpInitialize(
        HTTPAPI_VERSION Version,
        ULONG Flags,
        PVOID pReserved # NULL
    )
    ULONG HttpTerminate( # 必须传与init相同的参数
        ULONG Flags,
        PVOID pReserved
    )


    ctypedef struct HTTP_SERVER_SESSION_ID: pass
    ctypedef HTTP_SERVER_SESSION_ID* PHTTP_SERVER_SESSION_ID
    ULONG HttpCreateServerSession(
        HTTPAPI_VERSION Version,
        PHTTP_SERVER_SESSION_ID ServerSessionId, # out
        ULONG Reserved # 0
    )
    ULONG HttpCloseServerSession(
        HTTP_SERVER_SESSION_ID ServerSessionId
    )

    ULONG HttpSetServerSessionProperty(
        HTTP_SERVER_SESSION_ID ServerSessionId,
        HTTP_SERVER_PROPERTY Property,
        PVOID PropertyInformation,
        ULONG PropertyInformationLength
    )


    ctypedef struct HTTP_URL_GROUP_ID: pass
    ctypedef HTTP_URL_GROUP_ID* PHTTP_URL_GROUP_ID
    ULONG HttpCreateUrlGroup(
        HTTP_SERVER_SESSION_ID ServerSessionId,
        PHTTP_URL_GROUP_ID pUrlGroupId, # out
        ULONG Reserved
    )
    ULONG HttpCloseUrlGroup( # 会自动删除与其关联的URL，不用手动HttpRemoveUrlFromUrlGroup
        HTTP_URL_GROUP_ID UrlGroupId
    )

    ctypedef ULONGLONG HTTP_URL_CONTEXT
    ULONG HttpAddUrlToUrlGroup(
        HTTP_URL_GROUP_ID UrlGroupId,
        PCWSTR pFullyQualifiedUrl,
        HTTP_URL_CONTEXT UrlContext, # optional，允许用户自定义的一个数字，之后每次HTTP_REQUEST收到时会加上
        ULONG Reserved
    )

    ctypedef struct HTTP_PROPERTY_FLAGS:
        bint Present
        bint _[31]
    ctypedef struct HTTP_BINDING_INFO: # 将队列绑定到URL组里。设计上二者独立，但实际都只会创建一个
        HTTP_PROPERTY_FLAGS Flags
        HANDLE RequestQueueHandle
    ULONG HttpSetUrlGroupProperty(
        HTTP_URL_GROUP_ID UrlGroupId,
        HTTP_SERVER_PROPERTY Property, # 要设置的属性类型
        PVOID PropertyInformation, # 属性的值
        ULONG PropertyInformationLength # sizeof(值)
    )


    ctypedef PVOID PSECURITY_ATTRIBUTES
    ULONG HttpCreateRequestQueue(
        HTTPAPI_VERSION Version,
        PCWSTR Name, # optional，用于其它进程按名称访问Q
        PSECURITY_ATTRIBUTES SecurityAttributes, # optional，不考虑使用
        ULONG Flags, # optional，用于按名称打开而非创建
        PHANDLE RequestQueueHandle # out
    )
    ULONG HttpCloseRequestQueue(
        HANDLE RequestQueueHandle
    )

    ULONG HttpSetRequestQueueProperty(
        HANDLE RequestQueueHandle,
        HTTP_SERVER_PROPERTY Property,
        PVOID PropertyInformation,
        ULONG PropertyInformationLength,
        ULONG Reserved1,
        PVOID Reserved2
    )

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