How did the diplomatic etiquette of the Qing Dynasty change?

The etiquette dispute between the Qianlong Dynasty and Madzar's Nigerian ambassador to China and Britain, the establishment of the Prime Minister's yamen in the Qing Dynasty after the two Opium Wars, the abolition of discriminatory words such as "Yi" in diplomacy, the demarcation of the embassy boundary after the signing of the "Xin Chou Treaty", the promotion of the Ministry of Foreign Affairs, and the sending of a prince to apologize for the murdered German ambassador show that the diplomatic etiquette in the Qing Dynasty is independent in form (but in essence it is the equivalence of "thick versus thin")