fcli sc-dast sensor disable : host unknow but user is able to ping the host

[james-du1]

fcli sc-dast sensor disable : host unknow but user is able to ping the host
note: also have tried on VM which should be able to connect without configuring the host, but same error

[rsenden]

I experienced this issue before as well, but was hoping that it was an environmental issue. It took a lot of debugging effort to resolve this issue as it was caused by some hidden characters (probably copied from the Swagger page) that were not displayed by my IDE. Only after printing out the byte values for a known working host name allowed me to identify this issue.

Working host name:
115 99 100 97 115 116 97 112 105 46 117 97 116 46 102 111 114 116 105 102 121 104 111 115 116 101 100 46 110 101 116

UnknownHostException (notice the 3 extra negative values at the end):
115 99 100 97 115 116 97 112 105 46 117 97 116 46 102 111 114 116 105 102 121 104 111 115 116 101 100 46 110 101 116 -30 -128 -117 

Even more confusing was that these extra characters didn't come from the hostname itself (i.e. the host name stored in the session), but from the endpoint URI that is being appended to the base URL:

unirest.post("<hidden chars>/api/v2/scanners/{id}/set-scanner-enabled-value")

Being before the first slash, Unirest/Apache HTTP Client considered these hidden characters specified in the endpoint URI to be part of the host name.