code: public CharacterFittingResponse postCharactersCharacterIdFittings(Integer characterId, String datasource,
              String token, CharacterFitting characterFitting) throws ApiException {
          ApiResponse<CharacterFittingResponse> resp = postCharactersCharacterIdFittingsWithHttpInfo(characterId,
                  datasource, token, characterFitting);
          return resp.getData();
      }
docs: Create fitting Save a new fitting for a character --- SSO Scope:
  esi-fittings.write_fittings.v1
  
  @param characterId
  An EVE character ID (required)
  @param datasource
  The server name you would like data from (optional, default to
  tranquility)
  @param token
  Access token to use if unable to set a header (optional)
  @param characterFitting
  (optional)
  @return CharacterFittingResponse
  @throws ApiException
  If fail to call the API, e.g. server error or cannot
  deserialize the response body