[mav]

I'm trying to use the so called 'Deprecated API' of jdownloader ...

in the attached xlsx are some differences between the documentation here https://my.jdownloader.org/developers and http://localhost:53128/help (default port 3128 = 53128 in my setup) - some methods are missing / params are different

maybe just some stupid mistake on my side but API seems not consistent: (get, post) and how parameters are supposed to be passed according to api docs
there is no mention, which of the http / rest methods are supposed to be used per API call and the response headers suggest that OPTIONS, GET, POST are implemented for all calls (as does the docs)

some samples, I've tried with mixed success - detailed results are below in code sections

request header is set {"Content-Type": "application/json; charset=utf-8"}

hope you can put me on the right track. thanks!

querypackages: {"availableOfflineCount":true,"availableOnlineCount":true,"availableTempUnknownCount":true,"availabl eUnknownCount":true,"bytesTotal":true,"childCount":true,"comment":true,"enabled":true,"hosts":true," maxResults":-1,"packageUUIDs":[],"priority":
true,"saveTo":true,"startAt":0,"status":true}
querypackages, GET, parameters as json -> url encoded - ok
querypackages, GET, parameters -> url encoded - BAD_PARAMETERS
querypackages, POST, parameters as json -> body - BAD_PARAMETERS

queryLinks: {"availability":true,"bytesTotal":true,"comment":true,"enabled":true,"host":true,"jobUUIDs":[],"maxResults":-1,"packageUUIDs":[1699409911552],"password":true,"priority":true,"startAt":0,"status":true,"url":true,"variantID":true,"variantIcon" :true,
"variantName":true,"variants":true}
queryLinks, GET, parameters as json -> url encoded - ok
queryLinks, GET, parameters -> url encoded - BAD_PARAMETERS
queryLinks, POST, parameters as json -> body - BAD_PARAMETERS

setComment: {"linkIds":[1699409911553],"packageIds":[1699409911552],"allPackageLinks":false,"comment":"newtestfilecommentnospaces"}
setComment, GET, parameters as json -> url encoded - BAD_PARAMETERS
setComment, GET, parameters -> url encoded - BAD_PARAMETERS
setComment, POST, parameters as json -> body - BAD_PARAMETERS

setComment: {"linkIds":[],"packageIds":[1699405618466],"allPackageLinks":true,"comment":"newtestpackagecommentnospacesalllinks"}
setComment, GET, parameters as json -> url encoded - BAD_PARAMETERS
setComment, GET, parameters -> url encoded - BAD_PARAMETERS
setComment, POST, parameters as json -> body - BAD_PARAMETERS

setEnabled: {"enabled":false,"linkIds":[],"packageIds":[1699405618466]}
setEnabled, GET, parameters as json -> url encoded - BAD_PARAMETERS
setEnabled, GET, parameters -> url encoded - BAD_PARAMETERS
setEnabled, POST, parameters as json -> body - BAD_PARAMETERS

setEnabled: {"enabled":false,"linkIds":[],"packageIds":[1699405618466]}
setEnabled, GET, parameters as json -> url encoded - BAD_PARAMETERS
setEnabled, GET, paraeters -> url encoded - BAD_PARAMETERS
setEnabled, POST, parameters as json -> body - BAD_PARAMETERS

setEnabled: {"enabled":false,"linkIds":[1699405618481],"packageIds":[1699405618466]}
setEnabled, GET, parameters as json -> url encoded - BAD_PARAMETERS
setEnabled, GET, parameters -> url encoded - BAD_PARAMETERS
setEnabled, POST, parameters as json -> body - BAD_PARAMETERS

addContainer - ok (somewhat)
Based on java source code, I was able to "guess" based on filetype (extension) and url parsing how to add a DLC. Call is successfull, when parameters are passed in url encoded form, not as json.
request: GET /linkgrabberv2/addContainer?type=dlc&content=;base64,base64enc_DLC_file_content
source code:
* src/org/jdownloader/api/linkcollector/v2/LinkCollectorAPIImplV2.java#L746 -> param type
File tmp = Application.getTempResource("uploads/linkcollectorAPI" + System.nanoTime() + "." + type);
* src/org/jdownloader/api/linkcollector/v2/LinkCollectorAPIImplV2.java#L730 -> param content
final int base64Index = dataURL.indexOf(";base64,");

querypackages, GET, parameters as json -> url encoded
GET localhost:53128/linkgrabberv2/queryPackages?%7B%22availableOfflineCount%22%3Atrue%2C%22availableOnlineCount%22%3Atrue%2C%22availableTempUnknownCount%22%3Atrue%2C%22availableUnknownCount%22%3Atrue%2C%22bytesTotal%22%3Atrue%2C%22childCount%22%3Atrue%2C%22comment%22%3Atrue%2C%22enabled%22%3Atrue%2
C%22hosts%22%3Atrue%2C%22maxResults%22%3A-1%2C%22packageUUIDs%22%3A%5B%5D%2C%22priority%22%3Atrue%2C%22saveTo%22%3Atrue%2C%22startAt%22%3A0%2C%22status%22%3Atrue%7D
200 {"data":[{"onlineCount":0,"offlineCount":0,"saveTo":"C:\\temp\\testpackage","unknownCount":1,"hosts":["http links"],"name":"testpackage","childCount":1,"comment":"TEST PACKAGE COMMENT","uuid":1699409911552,"enabled":true,"tempUnknownCount":0}]}

querypackages, GET, parameters -> url encoded
GET localhost:53128/linkgrabberv2/queryPackages?availableOfflineCount=True&availableOnlineCount=True&availableTempUnknownCount=True&availableUnknownCount=True&bytesTotal=True&childCount=True&comment=True&enabled=True&hosts=True&maxResults=-1&packageUUIDs=%5B%5D&priority=True&saveTo=True&startAt=0&s
tatus=True
400 {
 "src"  : "DEVICE",
 "data" : "/linkgrabberv2/queryPackages?availableOfflineCount=True&availableOnlineCount=True&availableTempUnknownCount=True&availableUnknownCount=True&bytesTotal=True&childCount=True&comment=True&enabled=True&hosts=True&maxResults=-1&packageUUIDs=%5B%5D&priority=True&saveTo=True&startAt=0&status=Tr
ue",
 "type" : "BAD_PARAMETERS"
}

querypackages, POST, parameters as json -> body
POST localhost:53128/linkgrabberv2/queryPackages BODY: {"availableOfflineCount":true,"availableOnlineCount":true,"availableTempUnknownCount":true,"availableUnknownCount":true,"bytesTotal":true,"childCount":true,"comment":true,"enabled":true,"hosts":true,"maxResults":-1,"packageUUIDs":[],"priority":
true,"saveTo":true,"startAt":0,"status":true}

400 {
 "src"  : "DEVICE",
 "data" : "/linkgrabberv2/queryPackages",
 "type" : "BAD_PARAMETERS"
}

queryLinks, GET, parameters as json -> url encoded
GET localhost:53128/linkgrabberv2/queryLinks?%7B%22availability%22%3Atrue%2C%22bytesTotal%22%3Atrue%2C%22comment%22%3Atrue%2C%22enabled%22%3Atrue%2C%22host%22%3Atrue%2C%22jobUUIDs%22%3A%5B%5D%2C%22maxResults%22%3A-1%2C%22packageUUIDs%22%3A%5B1699409911552%5D%2C%22password%22%3Atrue%2C%22priority%22
%3Atrue%2C%22startAt%22%3A0%2C%22status%22%3Atrue%2C%22url%22%3Atrue%2C%22variantID%22%3Atrue%2C%22variantIcon%22%3Atrue%2C%22variantName%22%3Atrue%2C%22variants%22%3Atrue%7D
200 {"data":[{"host":"http links","name":"testfile.zip","comment":"TEST LINK COMMENT","availability":"UNKNOWN","packageUUID":1699409911552,"uuid":1699409911553,"url":"**External links are only visible to Support Staff**,"enabled":true}]}

queryLinks, GET, parameters -> url encoded
GET localhost:53128/linkgrabberv2/queryLinks?availability=True&bytesTotal=True&comment=True&enabled=True&host=True&jobUUIDs=%5B%5D&maxResults=-1&packageUUIDs=%5B1699409911552%5D&password=True&priority=True&startAt=0&status=True&url=True&variantID=True&variantIcon=True&variantName=True&variants=True

400 {
 "src"  : "DEVICE",
 "data" : "/linkgrabberv2/queryLinks?availability=True&bytesTotal=True&comment=True&enabled=True&host=True&jobUUIDs=%5B%5D&maxResults=-1&packageUUIDs=%5B1699409911552%5D&password=True&priority=True&startAt=0&status=True&url=True&variantID=True&variantIcon=True&variantName=True&variants=True",
 "type" : "BAD_PARAMETERS"
}

queryLinks, POST, parameters as json -> body
POST localhost:53128/linkgrabberv2/queryLinks BODY: {"availability":true,"bytesTotal":true,"comment":true,"enabled":true,"host":true,"jobUUIDs":[],"maxResults":-1,"packageUUIDs":[1699409911552],"password":true,"priority":true,"startAt":0,"status":true,"url":true,"variantID":true,"variantIcon":true,
"variantName":true,"variants":true}
400 {
 "src"  : "DEVICE",
 "data" : "/linkgrabberv2/queryLinks",
 "type" : "BAD_PARAMETERS"
}

setComment, GET, parameters as json -> url encoded
GET localhost:53128/linkgrabberv2/setComment?%7B%22linkIds%22%3A%5B1699409911553%5D%2C%22packageIds%22%3A%5B1699409911552%5D%2C%22allPackageLinks%22%3Afalse%2C%22comment%22%3A%22newtestfilecommentnospaces%22%7D
400 {
 "src"  : "DEVICE",
 "data" : "/linkgrabberv2/setComment?%7B%22linkIds%22%3A%5B1699409911553%5D%2C%22packageIds%22%3A%5B1699409911552%5D%2C%22allPackageLinks%22%3Afalse%2C%22comment%22%3A%22newtestfilecommentnospaces%22%7D",
 "type" : "BAD_PARAMETERS"
}

setComment, GET, parameters -> url encoded
GET localhost:53128/linkgrabberv2/setComment?linkIds=%5B1699409911553%5D&packageIds=%5B1699409911552%5D&allPackageLinks=False&comment=newtestfilecommentnospaces
400 {
 "src"  : "DEVICE",
 "data" : "False",
 "type" : "BAD_PARAMETERS"
}

setComment, POST, parameters as json -> body
POST localhost:53128/linkgrabberv2/setComment BODY: {"linkIds":[1699409911553],"packageIds":[1699409911552],"allPackageLinks":false,"comment":"newtestfilecommentnospaces"}
400 {
 "src"  : "DEVICE",
 "data" : "/linkgrabberv2/setComment",
 "type" : "BAD_PARAMETERS"
}

setComment, GET, parameters as json -> url encoded
GET localhost:53128/linkgrabberv2/setComment?%7B%22linkIds%22%3A%5B%5D%2C%22packageIds%22%3A%5B1699405618466%5D%2C%22allPackageLinks%22%3Atrue%2C%22comment%22%3A%22newtestpackagecommentnospacesalllinks%22%7D
400 {
 "src"  : "DEVICE",
 "data" : "/linkgrabberv2/setComment?%7B%22linkIds%22%3A%5B%5D%2C%22packageIds%22%3A%5B1699405618466%5D%2C%22allPackageLinks%22%3Atrue%2C%22comment%22%3A%22newtestpackagecommentnospacesalllinks%22%7D",
 "type" : "BAD_PARAMETERS"
}

setComment, GET, parameters -> url encoded
GET localhost:53128/linkgrabberv2/setComment?linkIds=%5B%5D&packageIds=%5B1699405618466%5D&allPackageLinks=True&comment=newtestpackagecommentnospacesalllinks
400 {
 "src"  : "DEVICE",
 "data" : "True",
 "type" : "BAD_PARAMETERS"
}

setComment, POST, parameters as json -> body
POST localhost:53128/linkgrabberv2/setComment BODY: {"linkIds":[],"packageIds":[1699405618466],"allPackageLinks":true,"comment":"newtestpackagecommentnospacesalllinks"}
400 {
 "src"  : "DEVICE",
 "data" : "/linkgrabberv2/setComment",
 "type" : "BAD_PARAMETERS"
}

setEnabled, GET, parameters as json -> url encoded
GET localhost:53128/linkgrabberv2/setEnabled?%7B%22enabled%22%3Afalse%2C%22packageIds%22%3A%5B1699405618466%5D%7D
400 {
 "src"  : "DEVICE",
 "data" : "/linkgrabberv2/setEnabled?%7B%22enabled%22%3Afalse%2C%22packageIds%22%3A%5B1699405618466%5D%7D",
 "type" : "BAD_PARAMETERS"
}

setEnabled, GET, parameters -> url encoded
GET localhost:53128/linkgrabberv2/setEnabled?enabled=False&packageIds=%5B1699405618466%5D
400 {
 "src"  : "DEVICE",
 "data" : "/linkgrabberv2/setEnabled?enabled=False&packageIds=%5B1699405618466%5D",
 "type" : "BAD_PARAMETERS"
}

setEnabled, POST, parameters as json -> body
POST localhost:53128/linkgrabberv2/setEnabled BODY: {"enabled":false,"packageIds":[1699405618466]}
400 {
 "src"  : "DEVICE",
 "data" : "/linkgrabberv2/setEnabled",
 "type" : "BAD_PARAMETERS"
}

setEnabled, GET, parameters as json -> url encoded
GET localhost:53128/linkgrabberv2/setEnabled?%7B%22enabled%22%3Afalse%2C%22linkIds%22%3A%5B%5D%2C%22packageIds%22%3A%5B1699405618466%5D%7D
400 {
 "src"  : "DEVICE",
 "data" : "/linkgrabberv2/setEnabled?%7B%22enabled%22%3Afalse%2C%22linkIds%22%3A%5B%5D%2C%22packageIds%22%3A%5B1699405618466%5D%7D",
 "type" : "BAD_PARAMETERS"
}

setEnabled, GET, parameters -> url encoded
GET localhost:53128/linkgrabberv2/setEnabled?enabled=False&linkIds=%5B%5D&packageIds=%5B1699405618466%5D
400 {
 "src"  : "DEVICE",
 "data" : "False",
 "type" : "BAD_PARAMETERS"
}

setEnabled, POST, parameters as json -> body
POST localhost:53128/linkgrabberv2/setEnabled BODY: {"enabled":false,"linkIds":[],"packageIds":[1699405618466]}
400 {
 "src"  : "DEVICE",
 "data" : "/linkgrabberv2/setEnabled",
 "type" : "BAD_PARAMETERS"
}

setEnabled, GET, parameters as json -> url encoded
GET localhost:53128/linkgrabberv2/setEnabled?%7B%22enabled%22%3Afalse%2C%22linkIds%22%3A%5B1699405618481%5D%2C%22packageIds%22%3A%5B1699405618466%5D%7D
400 {
 "src"  : "DEVICE",
 "data" : "/linkgrabberv2/setEnabled?%7B%22enabled%22%3Afalse%2C%22linkIds%22%3A%5B1699405618481%5D%2C%22packageIds%22%3A%5B1699405618466%5D%7D",
 "type" : "BAD_PARAMETERS"
}

setEnabled, GET, parameters -> url encoded
GET localhost:53128/linkgrabberv2/setEnabled?enabled=False&linkIds=%5B1699405618481%5D&packageIds=%5B1699405618466%5D
400 {
 "src"  : "DEVICE",
 "data" : "False",
 "type" : "BAD_PARAMETERS"
}

setEnabled, POST, parameters as json -> body
POST localhost:53128/linkgrabberv2/setEnabled BODY: {"enabled":false,"linkIds":[1699405618481],"packageIds":[1699405618466]}
400 {
 "src"  : "DEVICE",
 "data" : "/linkgrabberv2/setEnabled",
 "type" : "BAD_PARAMETERS"
}