diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6a0ffdd42..7a7a943e5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -29,7 +29,12 @@ ENDIF()
 # Find required dependencies
 INCLUDE_DIRECTORIES(src include deps/http-parser)
 
-FILE(GLOB SRC_HTTP deps/http-parser/*.c)
+IF (WIN32 AND NOT MINGW)
+	ADD_DEFINITIONS(-DGIT_WINHTTP)
+ELSE ()
+	FIND_PACKAGE(OpenSSL)
+	FILE(GLOB SRC_HTTP deps/http-parser/*.c)
+ENDIF()
 
 # Specify sha1 implementation
 IF (SHA1_TYPE STREQUAL "ppc")
@@ -75,7 +80,7 @@ OPTION (PROFILE "Generate profiling information" OFF)
 
 # Platform specific compilation flags
 IF (MSVC)
-	# Not using __stdcall with the CRT causes problems
+	# Default to stdcall, as that's what the CLR expects and how the Windows API is built
 	OPTION (STDCALL "Buildl libgit2 with the __stdcall convention" ON)
 
 	SET(CMAKE_C_FLAGS "/W4 /MP /nologo /Zi ${CMAKE_C_FLAGS}")
@@ -106,7 +111,6 @@ IF (NOT CMAKE_BUILD_TYPE)
 	SET(CMAKE_BUILD_TYPE "Debug" CACHE STRING "Choose the type of build, options are: Debug Release RelWithDebInfo MinSizeRel." FORCE)
 ENDIF ()
 
-FIND_PACKAGE(OpenSSL)
 IF (OPENSSL_FOUND)
   ADD_DEFINITIONS(-DGIT_SSL)
   INCLUDE_DIRECTORIES(${OPENSSL_INCLUDE_DIR})
diff --git a/src/transports/http.c b/src/transports/http.c
index de33f56ea..f1619c51f 100644
--- a/src/transports/http.c
+++ b/src/transports/http.c
@@ -4,7 +4,6 @@
  * This file is part of libgit2, distributed under the GNU GPL v2 with
  * a Linking Exception. For full terms see the included COPYING file.
  */
-
 #include <stdlib.h>
 #include "git2.h"
 #include "http_parser.h"
@@ -20,6 +19,13 @@
 #include "filebuf.h"
 #include "repository.h"
 #include "protocol.h"
+#if GIT_WINHTTP
+# include <winhttp.h>
+# pragma comment(lib, "winhttp.lib")
+#endif
+
+#define WIDEN2(s) L ## s
+#define WIDEN(s) WIDEN2(s)
 
 enum last_cb {
 	NONE,
@@ -47,6 +53,11 @@ typedef struct {
 #ifdef GIT_WIN32
 	WSADATA wsd;
 #endif
+#ifdef GIT_WINHTTP
+	HINTERNET session;
+	HINTERNET connection;
+	HINTERNET request;
+#endif
 } transport_http;
 
 static int gen_request(git_buf *buf, const char *path, const char *host, const char *op,
@@ -77,17 +88,158 @@ static int gen_request(git_buf *buf, const char *path, const char *host, const c
 	return 0;
 }
 
-static int do_connect(transport_http *t, const char *host, const char *port)
+static int send_request(transport_http *t, const char *service, void *data, ssize_t content_length, int ls)
 {
+#ifndef GIT_WINHTTP
+	git_buf request = GIT_BUF_INIT;
+	const char *verb;
+
+	verb = ls ? "GET" : "POST";
+	/* Generate and send the HTTP request */
+	if (gen_request(&request, t->path, t->host, verb, service, content_length, ls) < 0) {
+		giterr_set(GITERR_NET, "Failed to generate request");
+		return -1;
+	}
+
+
+	if (gitno_send((git_transport *) t, request.ptr, request.size, 0) < 0) {
+		git_buf_free(&request);
+		return -1;
+	}
+
+	if (content_length) {
+		if (gitno_send((git_transport *) t, data, content_length, 0) < 0)
+			return -1;
+	}
+
+	return 0;
+#else
+	wchar_t *url, *verb, *ct;
+	git_buf buf = GIT_BUF_INIT;
+	BOOL ret;
+	DWORD flags;
+	void *buffer;
+	wchar_t *types[] = {
+		L"*/*",
+		NULL,
+	};
+
+	verb = ls ? L"GET" : L"POST";
+	buffer = data ? data : WINHTTP_NO_REQUEST_DATA;
+	flags = t->parent.use_ssl ? WINHTTP_FLAG_SECURE : 0;
+
+	if (ls)
+		git_buf_printf(&buf, "%s/info/refs?service=git-%s", t->path, service);
+	else
+		git_buf_printf(&buf, "%s/git-%s", t->path, service);
+
+	if (git_buf_oom(&buf))
+		return -1;
+
+	url = gitwin_to_utf16(git_buf_cstr(&buf));
+	if (!url)
+		goto on_error;
+
+	t->request = WinHttpOpenRequest(t->connection, verb, url, NULL, WINHTTP_NO_REFERER, types, flags);
+	git__free(url);
+	if (t->request == NULL) {
+		git_buf_free(&buf);
+		giterr_set(GITERR_OS, "Failed to open request");
+		return -1;
+	}
+
+	git_buf_clear(&buf);
+	if (git_buf_printf(&buf, "Content-Type: application/x-git-%s-request", service) < 0)
+		goto on_error;
+	ct = gitwin_to_utf16(git_buf_cstr(&buf));
+	if (!ct)
+		goto on_error;
+
+	if (WinHttpAddRequestHeaders(t->request, ct, (ULONG) -1L, WINHTTP_ADDREQ_FLAG_ADD) == FALSE) {
+		giterr_set(GITERR_OS, "Failed to add a header to the request");
+		goto on_error;
+	}
+
+	if (!t->parent.check_cert) {
+		int flags = SECURITY_FLAG_IGNORE_CERT_CN_INVALID | SECURITY_FLAG_IGNORE_CERT_DATE_INVALID | SECURITY_FLAG_IGNORE_UNKNOWN_CA;
+		if (WinHttpSetOption(t->request, WINHTTP_OPTION_SECURITY_FLAGS, &flags, sizeof(flags)) == FALSE) {
+			giterr_set(GITERR_OS, "Failed to set options to ignore cert errors");
+			goto on_error;
+		}
+	}
+
+	if (WinHttpSendRequest(t->request, WINHTTP_NO_ADDITIONAL_HEADERS, 0,
+		data, content_length, content_length, 0) == FALSE) {
+		giterr_set(GITERR_OS, "Failed to send request");
+		goto on_error;
+	}
+
+	ret = WinHttpReceiveResponse(t->request, NULL);
+	if (ret == FALSE) {
+		giterr_set(GITERR_OS, "Failed to receive response");
+		goto on_error;
+	}
+
+	return 0;
+
+on_error:
+	git_buf_free(&buf);
+	if (t->request)
+		WinHttpCloseHandle(t->request);
+	t->request = NULL;
+	return -1;
+#endif
+}
+
+static int do_connect(transport_http *t)
+{
+#ifndef GIT_WINHTTP
 	if (t->parent.connected && http_should_keep_alive(&t->parser))
 		return 0;
 
-	if (gitno_connect((git_transport *) t, host, port) < 0)
+	if (gitno_connect((git_transport *) t, t->host, t->port) < 0)
 		return -1;
 
 	t->parent.connected = 1;
 
 	return 0;
+#else
+	wchar_t *ua = L"git/1.0 (libgit2 " WIDEN(LIBGIT2_VERSION) L")";
+	wchar_t *host;
+	int32_t port;
+
+	t->session = WinHttpOpen(ua, WINHTTP_ACCESS_TYPE_DEFAULT_PROXY,
+		WINHTTP_NO_PROXY_NAME, WINHTTP_NO_PROXY_BYPASS, 0);
+
+	if (t->session == NULL) {
+		giterr_set(GITERR_OS, "Failed to init WinHTTP");
+		goto on_error;
+	}
+
+	host = gitwin_to_utf16(t->host);
+	if (host == NULL)
+		goto on_error;
+
+	if (git__strtol32(&port, t->port, NULL, 10) < 0)
+		goto on_error;
+
+	t->connection = WinHttpConnect(t->session, host, port, 0);
+	git__free(host);
+	if (t->connection == NULL) {
+		giterr_set(GITERR_OS, "Failed to connect to host");
+		goto on_error;
+	}
+
+	t->parent.connected = 1;
+	return 0;
+
+on_error:
+	if (t->session) {
+		WinHttpCloseHandle(t->session);
+		t->session = NULL;
+	}
+	return -1;
+#endif
 }
 
 /*
@@ -216,13 +368,18 @@ static int http_recv_cb(gitno_buffer *buf)
 	git_transport *transport = (git_transport *) buf->cb_data;
 	transport_http *t = (transport_http *) transport;
 	size_t old_len;
-	gitno_buffer inner;
 	char buffer[2048];
+#ifdef GIT_WINHTTP
+	DWORD recvd;
+#else
+	gitno_buffer inner;
 	int error;
+#endif
 
 	if (t->transfer_finished)
 		return 0;
 
+#ifndef GIT_WINHTTP
 	gitno_buffer_setup(transport, &inner, buffer, sizeof(buffer));
 
 	if ((error = gitno_recv(&inner)) < 0)
@@ -232,6 +389,21 @@ static int http_recv_cb(gitno_buffer *buf)
 	http_parser_execute(&t->parser, &t->settings, inner.data, inner.offset);
 	if (t->error < 0)
 		return t->error;
+#else
+	old_len = buf->offset;
+	if (WinHttpReadData(t->request, buffer, sizeof(buffer), &recvd) == FALSE) {
+		giterr_set(GITERR_OS, "Failed to read data from the network");
+		return t->error = -1;
+	}
+
+	if (buf->len - buf->offset < recvd) {
+		giterr_set(GITERR_NET, "Can't fit data in the buffer");
+		return t->error = -1;
+	}
+
+	memcpy(buf->data + buf->offset, buffer, recvd);
+	buf->offset += recvd;
+#endif
 
 	return (int)(buf->offset - old_len);
 }
@@ -241,6 +413,8 @@ static void setup_gitno_buffer(git_transport *transport)
 {
 	transport_http *t = (transport_http *) transport;
 
+	/* WinHTTP takes care of this for us */
+#ifndef GIT_WINHTTP
 	http_parser_init(&t->parser, HTTP_RESPONSE);
 	t->parser.data = t;
 	t->transfer_finished = 0;
@@ -250,6 +424,7 @@ static void setup_gitno_buffer(git_transport *transport)
 	t->settings.on_headers_complete = on_headers_complete;
 	t->settings.on_body = on_body_fill_buffer;
 	t->settings.on_message_complete = on_message_complete;
+#endif
 
 	gitno_buffer_setup_callback(transport, &transport->buffer, t->buffer, sizeof(t->buffer), http_recv_cb, t);
 }
@@ -289,17 +464,10 @@ static int http_connect(git_transport *transport, int direction)
 	t->service = git__strdup(service);
 	GITERR_CHECK_ALLOC(t->service);
 
-	if ((ret = do_connect(t, t->host, t->port)) < 0)
+	if ((ret = do_connect(t)) < 0)
 		goto cleanup;
 
-	/* Generate and send the HTTP request */
-	if ((ret = gen_request(&request, t->path, t->host, "GET", service, 0, 1)) < 0) {
-		giterr_set(GITERR_NET, "Failed to generate request");
-		goto cleanup;
-	}
-
-
-	if (gitno_send(transport, request.ptr, request.size, 0) < 0)
+	if ((ret = send_request(t, "upload-pack", NULL, 0, 1)) < 0)
 		goto cleanup;
 
 	setup_gitno_buffer(transport);
@@ -332,36 +500,24 @@ cleanup:
 static int http_negotiation_step(struct git_transport *transport, void *data, size_t len)
 {
 	transport_http *t = (transport_http *) transport;
-	git_buf request = GIT_BUF_INIT;
 	int ret;
 
 	/* First, send the data as a HTTP POST request */
-	if ((ret = do_connect(t, t->host, t->port)) < 0)
+	if ((ret = do_connect(t)) < 0)
 		return -1;
 
-	if ((ret = gen_request(&request, t->path, t->host, "POST", "upload-pack", len, 0)) < 0)
-		goto on_error;
-
-	if ((ret = gitno_send(transport, request.ptr, request.size, 0)) < 0)
-		goto on_error;
-
-	if ((ret = gitno_send(transport, data, len, 0)) < 0)
-		goto on_error;
-
-	git_buf_free(&request);
+	if (send_request(t, "upload-pack", data, len, 0) < 0)
+		return -1;
 
 	/* Then we need to set up the buffer to grab data from the HTTP response */
 	setup_gitno_buffer(transport);
 
 	return 0;
-
-on_error:
-	git_buf_free(&request);
-	return -1;
 }
 
 static int http_close(git_transport *transport)
 {
+#ifndef GIT_WINHTTP
 	if (gitno_ssl_teardown(transport) < 0)
 		return -1;
 
@@ -369,6 +525,16 @@ static int http_close(git_transport *transport)
 		giterr_set(GITERR_OS, "Failed to close the socket: %s", strerror(errno));
 		return -1;
 	}
+#else
+	transport_http *t = (transport_http *) transport;
+
+	if (t->request)
+		WinHttpCloseHandle(t->request);
+	if (t->connection)
+		WinHttpCloseHandle(t->connection);
+	if (t->session)
+		WinHttpCloseHandle(t->session);
+#endif
 
 	transport->connected = 0;
 
@@ -445,7 +611,7 @@ int git_transport_http(git_transport **out)
 
 int git_transport_https(git_transport **out)
 {
-#ifdef GIT_SSL
+#if defined(GIT_SSL) || defined(GIT_WINHTTP)
 	transport_http *t;
 	if (git_transport_http((git_transport **)&t) < 0)
 		return -1;
diff --git a/src/util.c b/src/util.c
index 51bf843de..719714105 100644
--- a/src/util.c
+++ b/src/util.c
@@ -28,7 +28,7 @@ int git_libgit2_capabilities()
 #ifdef GIT_THREADS
 		| GIT_CAP_THREADS
 #endif
-#ifdef GIT_SSL
+#if defined(GIT_SSL) || defined(GIT_WINHTTP)
 		| GIT_CAP_HTTPS
 #endif
 	;