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diff --git a/externals/breakpad/src/tools/windows/converter_exe/http_client.h b/externals/breakpad/src/tools/windows/converter_exe/http_client.h
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+++ b/externals/breakpad/src/tools/windows/converter_exe/http_client.h
@@ -0,0 +1,96 @@
+// Copyright 2019 Google LLC
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google LLC nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef TOOLS_CRASH_CONVERTER_WINDOWS_HTTP_CLIENT_H_
+#define TOOLS_CRASH_CONVERTER_WINDOWS_HTTP_CLIENT_H_
+
+#include <tchar.h>
+#include <windows.h>
+#include <vector>
+
+typedef void* HttpHandle;
+
+namespace crash {
+
+// HttpClient provides an abstract layer for HTTP APIs. The actual
+// implementation can be based on either WinHttp or WinInet.
+class HttpClient {
+ public:
+  enum AccessType {
+    ACCESS_TYPE_PRECONFIG,
+    ACCESS_TYPE_DIRECT,
+    ACCESS_TYPE_PROXY,
+  };
+
+  virtual ~HttpClient() {}
+
+  virtual bool CrackUrl(const TCHAR* url,
+                        DWORD flags,
+                        TCHAR* scheme,
+                        size_t scheme_buffer_length,
+                        TCHAR* host,
+                        size_t host_buffer_length,
+                        TCHAR* uri,
+                        size_t uri_buffer_length,
+                        int* port) const = 0;
+  virtual bool Open(const TCHAR* user_agent,
+                    DWORD access_type,
+                    const TCHAR* proxy_name,
+                    const TCHAR* proxy_bypass,
+                    HttpHandle* session_handle) const = 0;
+  virtual bool Connect(HttpHandle session_handle,
+                       const TCHAR* server,
+                       int port,
+                       HttpHandle* connection_handle) const = 0;
+  virtual bool OpenRequest(HttpHandle connection_handle,
+                           const TCHAR* verb,
+                           const TCHAR* uri,
+                           const TCHAR* version,
+                           const TCHAR* referrer,
+                           bool is_secure,
+                           HttpHandle* request_handle) const = 0;
+  virtual bool SendRequest(HttpHandle request_handle,
+                           const TCHAR* headers,
+                           DWORD headers_length) const = 0;
+  virtual bool ReceiveResponse(HttpHandle request_handle) const = 0;
+  virtual bool GetHttpStatusCode(HttpHandle request_handle,
+                                 int* status_code) const = 0;
+  virtual bool GetContentLength(HttpHandle request_handle,
+                                DWORD* content_length) const = 0;
+  virtual bool ReadData(HttpHandle request_handle,
+                        void* buffer,
+                        DWORD buffer_length,
+                        DWORD* bytes_read) const = 0;
+  virtual bool Close(HttpHandle handle) const = 0;
+
+  static const DWORD kUnknownContentLength = (DWORD)-1;
+};
+
+}  // namespace crash
+
+#endif  // TOOLS_CRASH_CONVERTER_WINDOWS_HTTP_CLIENT_H_