![unable to load resource file 1003 claw unable to load resource file 1003 claw](https://europepmc.org/articles/PMC6278866/bin/msy180f2.jpg)
#UNABLE TO LOAD RESOURCE FILE 1003 CLAW SERIAL#
Many websites now use content delivery networks which may provide content from several different hosts, thus the delay could be significant for larger websites each host is requested in serial rather than parallel (each DNS request must complete before the next begins). While each environment is unique, response times exceeding 500ms are likely to be noticeable to an end-user. Such an issue can be isolated by utilizing a DNS application such as DIG which can report how long it took the DNS server to respond. This will only occur the first time the host is requested, or if the local caching period for the host DNS information has expired. Should a DNS server be slow to respond, the initialization of these functions for a new (non-cached) host will result in a delay until the result is provided by the DNS server(s). These functions are isInNet(), isResolvable(), and dnsResolve().
![unable to load resource file 1003 claw unable to load resource file 1003 claw](https://eur-lex.europa.eu/resource.html?uri=uriserv:OJ.C_.2011.137.01.0001.01.ENG.xhtml.C_2011137EN.01012401.tif.jpg)
A PAC file may leverage several functions which rely on the local DNS server(s) in order to resolve a requested host.