Spring boot restful webservice不能在localhost上运行

Question

我创建了一个带有spring boot的简单web服务，当我尝试在intelliJ中测试时，我在下面的图片中收到了消息。

这是我的控制器

class Solution(object):
    def numSquares(self,n):
        if(n == 0):
            return 0
        if(n == 1):
            return 1
        squares = self.findSquares(n) # returns a list of perfect squares <= n
        rows = len(squares)
        cols = n + 1
        mat = []
        for i in range(rows):
            mat.append([0] * cols)

        for i in range(cols):
            mat[0][i] = i

        for i in range(rows):
            mat[i][0] = 0

        min = mat[0][cols - 1]
        for i in range(1,rows):
            for j in range(1,cols):
                if(j < squares[i]):
                    mat[i][j] = mat[i - 1][j]

                else:
                    mat[i][j] = self.min(mat[i - 1][j], (j // squares[i] + (mat[i][j % squares[i]])))
                if(j == cols - 1 and mat[i][j] < min):
                    min = mat[i][j]
        '''
        for i in range(rows):
            for j in range(cols):
                print(mat[i][j],end=" ")
            print()
            '''
        return min

    def min(self,a,b):
        if(a <= b):
            return a
        else:
            return b


    def findSquares(self,n):

        i = 1
        squares = []
        while (i * i <= n):
            squares.append(i * i)
            i = i + 1
        return squares
'''
x = Solution()

print(x.numSquares(43))
'''