Method putheader

src/urllib3/connection.py:410–420

(self, header: str, *values: str)

        )

    def putheader(self, header: str, *values: str) -> None:  # type: ignore[override]
        """"""
        if not any(isinstance(v, str) and v == SKIP_HEADER for v in values):
            super().putheader(header, *values)
        elif to_str(header.lower()) not in SKIPPABLE_HEADERS:
            skippable_headers = "', '".join(
                [str.title(header) for header in sorted(SKIPPABLE_HEADERS)]
            )
            raise ValueError(
                f"urllib3.util.SKIP_HEADER only supports '{skippable_headers}'"
            )

    # `request` method's signature intentionally violates LSP.
    # urllib3's API is different from `http.client.HTTPConnection` and the subclassing is only incidental.