Set the URI scheme.
@param scheme the URI scheme, may contain URI template parameters.A {@code null} value will unset the URI scheme, but willnot unset the any scheme-specific-part components.
@return the updated UriBuilder.
@throws IllegalArgumentException if scheme is invalid.
Sets the URI scheme. The given scheme may contain URI template variables, and may also be {@code null} to clear the scheme of this builder.
@param scheme the URI scheme
@return this UriComponentsBuilder
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