import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

dom/fetch/FetchUtil.h

@@ -0,0 +1,42 @@
+#ifndef mozilla_dom_FetchUtil_h
+#define mozilla_dom_FetchUtil_h
+
+#include "nsString.h"
+#include "nsError.h"
+
+#include "mozilla/ErrorResult.h"
+#include "mozilla/dom/File.h"
+#include "mozilla/dom/FormData.h"
+
+namespace mozilla {
+namespace dom {
+
+class FetchUtil final
+{
+private:
+  FetchUtil() = delete;
+
+public:
+  /**
+  * Sets outMethod to a valid HTTP request method string based on an input method.
+  * Implements checks and normalization as specified by the Fetch specification.
+  * Returns NS_ERROR_DOM_SECURITY_ERR if the method is invalid.
+  * Otherwise returns NS_OK and the normalized method via outMethod.
+  */
+  static nsresult
+  GetValidRequestMethod(const nsACString& aMethod, nsCString& outMethod);
+
+  /**
+   * Extracts an HTTP header from a substring range.
+   */
+  static bool
+  ExtractHeader(nsACString::const_iterator& aStart,
+                nsACString::const_iterator& aEnd,
+                nsCString& aHeaderName,
+                nsCString& aHeaderValue,
+                bool* aWasEmptyHeader);
+};
+
+} // namespace dom
+} // namespace mozilla
+#endif