Download webpages for offline viewing but get PAGE NOT FOUND 404 in browser later

[albert kao]

I like to download webpages for offline viewing.
I do:
$ wget --reject robots.txt --limit-rate=200k --no-clobber --convert-links
--random-wait -r -p -E -e robots=off -U mozilla
https://netbasal.com/forwarding-form-controls-to-custom-control-components-in-angular-701e8406cc55

The download completed without error.

I open the downloaded webpage:
file:///home/ak/
netbasal.com/forwarding-form-controls-to-custom-control-components-in-angular-701e8406cc55.html

The browser display:
PAGE NOT FOUND
404
Out of nothing, something.


$ wget -V
GNU Wget 1.20.3 built on linux-gnu.

-cares +digest -gpgme +https +ipv6 +iri +large-file -metalink +nls
+ntlm +opie +psl +ssl/openssl

Wgetrc:
    /etc/wgetrc (system)
Locale:
    /usr/share/locale
Compile:
    gcc -DHAVE_CONFIG_H -DSYSTEM_WGETRC="/etc/wgetrc"
    -DLOCALEDIR="/usr/share/locale" -I. -I../../src -I../lib
    -I../../lib -Wdate-time -D_FORTIFY_SOURCE=2 -DHAVE_LIBSSL -DNDEBUG
    -g -O2 -fdebug-prefix-map=/build/wget-3oF214/wget-1.20.3=.
    -fstack-protector-strong -Wformat -Werror=format-security
    -DNO_SSLv2 -D_FILE_OFFSET_BITS=64 -g -Wall
Link:
    gcc -DHAVE_LIBSSL -DNDEBUG -g -O2
    -fdebug-prefix-map=/build/wget-3oF214/wget-1.20.3=.
    -fstack-protector-strong -Wformat -Werror=format-security
    -DNO_SSLv2 -D_FILE_OFFSET_BITS=64 -g -Wall -Wl,-Bsymbolic-functions
    -Wl,-z,relro -Wl,-z,now -lpcre2-8 -luuid -lidn2 -lssl -lcrypto -lz
    -lpsl ftp-opie.o openssl.o http-ntlm.o ../lib/libgnu.a