Response class for Range Not Satisfiable responses (status code 416).
The request entity has a media type which the server or resource does not support.
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Response class for Expectation Failed responses (status code 417).
The server cannot meet the requirements of the Expect request-header field.
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Response class for Too Many Requests responses (status code 429).
The user has sent too many requests in a given amount of time.
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Response class for Bad Gateway responses (status code 502).
The server was acting as a gateway or proxy and received an invalid response from the upstream server.
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Response class for Gateway Timeout responses (status code 504).
The server was acting as a gateway or proxy and did not receive a timely response from the upstream server.
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Response class for Gateway Timeout responses (status code 504).
The server was acting as a gateway or proxy and did not receive a timely response from the upstream server.
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Response class for Variant Also Negotiates responses (status code 506).
Transparent content negotiation for the request results in a circular reference.
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Response class for Network Authentication Required responses (status code 511).
The client needs to authenticate to gain network access.
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Map from option/keyword string to object with completion.