This little booger has been around for years and rears its ugly little head for me about every 2-3 months.
I’m a Mac user. I use Safari and Google Chrome as my web browsers of choice. Booker does not play well with Safari and openly states this with a yellow banner if you try.
Booker seems to get along better with Google Chrome, although using this combination is not without its own issues.
Here’s how this HTTP Error 400 works for me:
I log in like I usually do to use Booker. If I’m not using the hack I discovered at: Booker Login Problems then I end up logging in 6 or more times in a day. It seems to me that the more I have to log in to Booker, the quicker this bug rears its ugly head. This is not a finding I discovered using any scientific method, simply an observation. I will be using Booker normally and in the middle of something, when I get kicked out and have to log in again. As soon as I try to log in, I get the “HTTP Error 400” as shown below.
The only cure I have found for this is to delete all Booker cached data from my browser’s settings, refresh the Booker login page, and sign in again. Does this greatly disrupt my productivity? You bet it does. This happens every few months and it happened today!
I called Booker customer service about this issue roughly a year ago. They said it was a problem on my end with the browser I’m using. I remember rolling my eyes when they told me this since blaming Bookers problems on me seems to be a common practice. I will post more info from that email thread with Booker once I have time to find it.
Thanks for reading. I hope this is helpful.
Booker Scheduling Problems 