Help unsettling HTTP requests

[Yannick_M]

So I have been working on a little app for a few days now and I while using the android monitor in the android studio program I found some HTTP requests that look suspicious to me. They are partly even in Chinese or some other strange language. I would like to know if these are requests by a valid app that I installed but I doubt it since it sends a request to his website every time I install an app. Well see for your self:

07-31 22:03:50.627 23678-25820/? D/SDK: [null:-1] - SimpleHttpHelper RESPONSE success:
code=200
result=
url=http://ad.api.kaffnet.com/adserver/...237&country=US&network_type=1&imei=&pkg_name=<censored by me>&sdk_version=4.3.1.0.4101.13&language=en&os_version=7.1.1&aid=e63ed14b85b3805f&gaid=05313841-4e21-43d2-bfa1-30f96161f83a
07-31 22:03:50.627 23678-23678/? D/SDK: [null:-1] - -----------上传成功---------http://ad.api.kaffnet.com/adserver/v1/sdk/installreport/get

07-31 22:03:50.580 25842-25842/? I/AppsFlyer_1.18: Calling server for uninstall url: https://track.appsflyer.com/api/v2.3/uninsall?buildnumber=1.18

07-31 22:03:50.240 23678-23678/? D/SDK: [null:-1] - SimpleHttpHelper REQUEST:GET http://ad.api.kaffnet.com/adserver/...237&country=US&network_type=1&imei=&pkg_name=<censored by me>&sdk_version=4.3.1.0.4101.13&language=en&os_version=7.1.1&aid=e63ed14b85b3805f&gaid=05313841-4e21-43d2-bfa1-30f96161f83a
headers={user_agent=Dalvik/2.1.0 (Linux; U; Android 7.1.1; E6653 Build/32.4.A.0.160)}

I feel very unconfortable abount this. Please tell me what to do.