无法访问opencpu网址

Question

我使用以下命令在Ubuntu 18.04上安装了OpenCPU

# This code has been written by normanius under the CC BY-SA 4.0 license.
# License:    https://creativecommons.org/licenses/by-sa/4.0/
# Author:     normanius: https://stackoverflow.com/users/3388962/normanius
# Date:       August 2018
# Reference:  https://stackoverflow.com/a/51754466/3388962

import vtk
import numpy as np

###########################################################
# CREATE ARRAY VALUES
###########################################################
# Just create some fancy looking values for z.
n = 100
m = 50
xmin = -1; xmax = 1
ymin = -1; ymax = 1
x = np.linspace(xmin, xmax, n)
y = np.linspace(ymin, ymax, m)
x, y = np.meshgrid(x, y)
x, y = x.flatten(), y.flatten()
z = (x+y)*np.exp(-3.0*(x**2+y**2))

###########################################################
# CREATE PLANE
###########################################################
# Create a planar mesh of quadriliterals with nxm points.
# (SetOrigin and SetPointX only required if the extent
# of the plane should be the same. For the mapping
# of the scalar values, this is not required.)
plane = vtk.vtkPlaneSource()
plane.SetResolution(n-1,m-1)
plane.SetOrigin([xmin,ymin,0])  # Lower left corner
plane.SetPoint1([xmax,ymin,0])
plane.SetPoint2([xmin,ymax,0])
plane.Update()

# Map the values to the planar mesh.
# Assumption: same index i for scalars z[i] and mesh points
nPoints = plane.GetOutput().GetNumberOfPoints()
assert(nPoints == len(z))
# VTK has its own array format. Convert the input
# array (z) to a vtkFloatArray.
scalars = vtk.vtkFloatArray()
scalars.SetNumberOfValues(nPoints)
for i in range(nPoints):
    scalars.SetValue(i, z[i])
# Assign the scalar array.
plane.GetOutput().GetPointData().SetScalars(scalars)

###########################################################
# WRITE DATA
###########################################################
writer = vtk.vtkXMLPolyDataWriter()
writer.SetFileName('output.vtp')
writer.SetInputConnection(plane.GetOutputPort())
writer.Write() # => Use for example ParaView to see scalars

###########################################################
# VISUALIZATION
###########################################################
# This is a bit annoying: ensure a proper color-lookup.
colorSeries = vtk.vtkColorSeries()
colorSeries.SetColorScheme(vtk.vtkColorSeries.BREWER_DIVERGING_SPECTRAL_10)
lut = vtk.vtkColorTransferFunction()
lut.SetColorSpaceToHSV()
nColors = colorSeries.GetNumberOfColors()
zMin = np.min(z)
zMax = np.max(z)
for i in range(0, nColors):
    color = colorSeries.GetColor(i)
    color = [c/255.0 for c in color]
    t = zMin + float(zMax - zMin)/(nColors - 1) * i
    lut.AddRGBPoint(t, color[0], color[1], color[2])

# Mapper.
mapper = vtk.vtkPolyDataMapper()
mapper.SetInputConnection(plane.GetOutputPort())
mapper.ScalarVisibilityOn()
mapper.SetScalarModeToUsePointData()
mapper.SetLookupTable(lut)
mapper.SetColorModeToMapScalars()
# Actor.
actor = vtk.vtkActor()
actor.SetMapper(mapper)
# Renderer.
renderer = vtk.vtkRenderer()
renderer.SetBackground([0.5]*3)
# Render window and interactor.
renderWindow = vtk.vtkRenderWindow()
renderWindow.SetWindowName('Demo')
renderWindow.AddRenderer(renderer)
renderer.AddActor(actor)
interactor = vtk.vtkRenderWindowInteractor()
interactor.SetRenderWindow(renderWindow)
renderWindow.Render()
interactor.Start()

但是当我导航到http://localhost:12800/ocpu或http://localhost:12800/ocpu/library时 它通过在此服务器上找不到请求的URL / ocpu / library进行响应。

这是我的opencpu.conf文件

sudo add-apt-repository -y ppa:opencpu/opencpu-2.0
sudo apt-get update 
sudo apt-get upgrade
sudo apt-get install -y opencpu-server
sudo apt-get install -y rstudio-server