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Error 500 Request headers must contain only ASCII characters.

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After  December 5, 2018 an error is shown every time I try to get geocache via the "Get geocaches" in the GSAK-application.


2018-12-12 00:29:25 HttpRequestBegin: GET,https://api.Groundspeak.com/v1.0/geocaches/search/?lite=true&take=1&skip=0&q=box:%5B%5B50.65%2C6.75%5D%2C%5B50.35%2C8.0%5D%5D&Fields=referenceCode,name,difficulty,terrain,favoritepoints,trackablecount,placedDate,type,size,userdata,status,location,postedcoordinates,lastVisitedDate,ownerCode,ownerAlias,isPremiumOnly,ianaTimezoneId,relatedWebPage,owner[MembershipLevelId,hideCount,findCount,username]&Sort=id+

2018-12-12 00:29:27 Last response body: {"statusCode":500,"statusMessage":"Internal Server Error","errorMessage":"Request headers must contain only ASCII characters."} (ver:

There is no difference between ?lite=false&take=7000 and ?lite=true&take=1

There are no difference using different requests

I Think, it is a problem with the Ö-Umlaut in the cacher name.
When I use my basic account without Umlaute I get no error message.


I hope you can help



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