code: public ApiResponse<CharacterFittingResponse> postCharactersCharacterIdFittingsWithHttpInfo(Integer characterId,
              String datasource, String token, CharacterFitting characterFitting) throws ApiException {
          com.squareup.okhttp.Call call = postCharactersCharacterIdFittingsValidateBeforeCall(characterId, datasource,
                  token, characterFitting, null);
          Type localVarReturnType = new TypeToken<CharacterFittingResponse>() {
          }.getType();
          return apiClient.execute(call, localVarReturnType);
      }
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 ApiResponse&lt;CharacterFittingResponse&gt;
  @throws ApiException
  If fail to call the API, e.g. server error or cannot
  deserialize the response body