Apache cannot parse HTML content

After installing the apache2.0.63,20..html file this day, the file cannot be parsed and the HTML file is directly displayed.Code. I have never encountered such a situation at the beginning. Baidu found a related article.
Based on thisArticleThe method is as follows:
Go to the Apache main configuration file and search "addtype text/html. shtml ":

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1. # Addtype text/html. shtml. html. htm
2. # Addoutputfilter between des. shtml. html. htm

Remove # from the front of the two rows. Restart Apache to parse the HTML file.

However, Apache configuration has not been modified in this way before, and HTML can be supported normally. I wonder if the root cause is here. Please follow this method for the time being!