| name | 要设置的标头的键。区分大小写。 |
| value | 标头的预期值。 |
将 HTTP 请求标头设置为自定义值。
根据 RFC 2616，标头的键和值必须有效。字符串都不能包含某些非法字符，如控制字符。字符串都必须为非 null 且至少包含一个字符。有关更多信息，请参阅 RFC 2616，第 4.2 节。
调用 Send 后将无法调用此方法。
不能使用任何平台上的自定义值设置以下标头：accept-charset、access-control-request-headers、access-control-request-method、connection、date、dnt、expect、host、keep-alive、origin、referer、te、trailer、transfer-encoding、upgrade、via。
可以为 accept-encoding 标头设置自定义值，但生成的行为并不可靠，强烈建议将其自动处理，除非您可以接受出现异常结果带来的风险。content-length 标头将根据附加的 DownloadHandler 的内容（如果有）自动填充，无法设置为自定义值。x-unity-version 标头由 Unity 自动设置，可能无法设置为自定义值。user-agent 标头由 Unity 自动设置，不建议将其设置为自定义值。cookie 和 cookie2 标头由底层 Cookie 引擎自动管理。虽然确切的行为取决于平台，但如果通过此标头设置 Cookie，则通常会将 Cookie 附加到引擎设置的 Cookie。另请参阅：ClearCookieCache。
除上述情况外，在 WebGL 平台上以下标头由 Web 浏览器填充，因此可能没有自定义值：cookie、cookie2、user-agent。
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