GET request give Client Error 404

Is the 1000 request per hour fixed limt?

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{"source_code":["can't be blank"],"language_id":["can't be blank","language with id doesn't exist"]}

Have execution error for java

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POST SUBMISSION

C++, Java No execution

Help !!, an error in the gateway has occurred

Getting Different Errors for every new Request like Cross Origin 401 language code not Found