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There is a question on the Ru.SO that can't be opened (at least for me under Chrome and Edge) with HTTP 400 error:

I have made a dumb question on Meta.SE to reproduce this.

Question

Bad Request - Invalid URL

HTTP Error 400. The request URL is invalid.

In case of edit, direct URL can be used.

I believe it's because a "�" character in the URL of the question and the cyrillics. Only appear if the title contain both cyrillics and this character.

There is a question on the Ru.SO that can't be opened (at least for me under Chrome and Edge) with HTTP 400 error:

I have made a dumb question on Meta.SE to reproduce this.

Question

Bad Request - Invalid URL

HTTP Error 400. The request URL is invalid.

In case of edit, direct URL can be used.

I believe it's because a "�" character in the URL of the question and the cyrillics. Only appear if the title contain both cyrillics and this character.

There is a question on the Ru.SO that can't be opened (at least for me under Chrome and Edge) with HTTP 400 error:

I have made a dumb question on Meta.SE to reproduce this.

Question

Bad Request - Invalid URL

HTTP Error 400. The request URL is invalid.

In case of edit, direct URL can be used.

I believe it's because a "�" character in the URL of the question and the cyrillics. Only appear if the title contain both cyrillics and this character.

There is a question on the Ru.SO that can't be opened (at least for me under Chrome and Edge) with HTTP 400 error:

I have made a dumb question on Meta.SE to reproduce this.

Question

Bad Request - Invalid URL

HTTP Error 400. The request URL is invalid.

In case of edit, direct URL can be used.

I believe it's because a "�" character in the URL of the question and the cyrillics. Only appear if the title contain both cyrillics and this character.