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Format of HTTP request header names and values

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The name of the HTTP request header you want to set or remove can only contain:

  • Alphanumeric characters: a-z, A-Z, and 0-9
  • The following special characters: - and _

The value of the HTTP request header you want to set can only contain:

  • Alphanumeric characters: a-z, A-Z, and 0-9
  • The following special characters: _ :;.,\/"'?!(){}[]@<>=-+*#$&`|~^%

The maximum length of the HTTP request header value is 4 KB (~4,096 characters).

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