我今天也遇到了这个问题，最后发现是因为站点更新了。现在你可以访问这个网站找到需要的文件了。
fonts.googleapis.com一种办法是用这个域名代替你原来的字体库地址；
另一种是下载下来之后本地引入。
下面是你需要的资源：
/* cyrillic-ext */@font-face {
font-family: 'Arimo'
font-style: normal
font-weight: 400
src: local('Arimo'), url(https://fonts.gstatic.com/s/arimo/v9/an78_18DAUCSU6a4qacRuA.woff2) format('woff2')
unicode-range: U+0460-052F, U+20B4, U+2DE0-2DFF, U+A640-A69F
}
/* cyrillic */
@font-face {
font-family: 'Arimo'
font-style: normal
font-weight: 400
src: local('Arimo'), url(https://fonts.gstatic.com/s/arimo/v9/4NN7UQ_VsRBn7NDD9HKUPw.woff2) format('woff2')
unicode-range: U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116
}
/* greek-ext */
@font-face {
font-family: 'Arimo'
font-style: normal
font-weight: 400
src: local('Arimo'), url(https://fonts.gstatic.com/s/arimo/v9/ye-fuRt_0mKrPeIp6Mwa8A.woff2) format('woff2')
unicode-range: U+1F00-1FFF
}
/* greek */
@font-face {
font-family: 'Arimo'
font-style: normal
font-weight: 400
src: local('Arimo'), url(https://fonts.gstatic.com/s/arimo/v9/VF6T-UwCT6WyIiUKP6AykQ.woff2) format('woff2')
unicode-range: U+0370-03FF
}
/* hebrew */
@font-face {
font-family: 'Arimo'
font-style: normal
font-weight: 400
src: local('Arimo'), url(https://fonts.gstatic.com/s/arimo/v9/X3cUdzInOvbZ6zhcyjPc3w.woff2) format('woff2')
unicode-range: U+0590-05FF, U+20AA, U+25CC, U+FB1D-FB4F
}
/* vietnamese */
@font-face {
font-family: 'Arimo'
font-style: normal
font-weight: 400
src: local('Arimo'), url(https://fonts.gstatic.com/s/arimo/v9/eSHy7hCA8QR4qTF-59v60g.woff2) format('woff2')
unicode-range: U+0102-0103, U+1EA0-1EF9, U+20AB
}
/* latin-ext */
@font-face {
font-family: 'Arimo'
font-style: normal
font-weight: 400
src: local('Arimo'), url(https://fonts.gstatic.com/s/arimo/v9/V41d6938Z8eBLYL302F8Ig.woff2) format('woff2')
unicode-range: U+0100-024F, U+1E00-1EFF, U+20A0-20AB, U+20AD-20CF, U+2C60-2C7F, U+A720-A7FF
}
/* latin */
@font-face {
font-family: 'Arimo'
font-style: normal
font-weight: 400
src: local('Arimo'), url(https://fonts.gstatic.com/s/arimo/v9/HNu4Nzh6q8Es60EMNZhs9w.woff2) format('woff2')
unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2212, U+2215
}
/* cyrillic-ext */
@font-face {
font-family: 'Arimo'
font-style: normal
font-weight: 700
src: local('Arimo Bold'), local('Arimo-Bold'), url(https://fonts.gstatic.com/s/arimo/v9/ar6XjGD_YvbpY9XD5YxKTBTbgVql8nDJpwnrE27mub0.woff2) format('woff2')
unicode-range: U+0460-052F, U+20B4, U+2DE0-2DFF, U+A640-A69F
}
/* cyrillic */
@font-face {
font-family: 'Arimo'
font-style: normal
font-weight: 700
src: local('Arimo Bold'), local('Arimo-Bold'), url(https://fonts.gstatic.com/s/arimo/v9/XzFO_hPcAZmADxw_2htokBTbgVql8nDJpwnrE27mub0.woff2) format('woff2')
unicode-range: U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116
}
/* greek-ext */
@font-face {
font-family: 'Arimo'
font-style: normal
font-weight: 700
src: local('Arimo Bold'), local('Arimo-Bold'), url(https://fonts.gstatic.com/s/arimo/v9/Tq4Zh2K0uru54pu6hyua9BTbgVql8nDJpwnrE27mub0.woff2) format('woff2')
unicode-range: U+1F00-1FFF
}
/* greek */
@font-face {
font-family: 'Arimo'
font-style: normal
font-weight: 700
src: local('Arimo Bold'), local('Arimo-Bold'), url(https://fonts.gstatic.com/s/arimo/v9/gRIQMcBGUlcKSvTGaO9yHBTbgVql8nDJpwnrE27mub0.woff2) format('woff2')
unicode-range: U+0370-03FF
}
/* hebrew */
@font-face {
font-family: 'Arimo'
font-style: normal
font-weight: 700
src: local('Arimo Bold'), local('Arimo-Bold'), url(https://fonts.gstatic.com/s/arimo/v9/Jg7MGeIJdVGhHqsyezM8VRTbgVql8nDJpwnrE27mub0.woff2) format('woff2')
unicode-range: U+0590-05FF, U+20AA, U+25CC, U+FB1D-FB4F
}
/* vietnamese */
@font-face {
font-family: 'Arimo'
font-style: normal
font-weight: 700
src: local('Arimo Bold'), local('Arimo-Bold'), url(https://fonts.gstatic.com/s/arimo/v9/u0Tw4Txbkc9Av4uzN1j1aBTbgVql8nDJpwnrE27mub0.woff2) format('woff2')
unicode-range: U+0102-0103, U+1EA0-1EF9, U+20AB
}
/* latin-ext */
@font-face {
font-family: 'Arimo'
font-style: normal
font-weight: 700
src: local('Arimo Bold'), local('Arimo-Bold'), url(https://fonts.gstatic.com/s/arimo/v9/XCmwOdi6K62tkWaszbVGURTbgVql8nDJpwnrE27mub0.woff2) format('woff2')
unicode-range: U+0100-024F, U+1E00-1EFF, U+20A0-20AB, U+20AD-20CF, U+2C60-2C7F, U+A720-A7FF
}
/* latin */
@font-face {
font-family: 'Arimo'
font-style: normal
font-weight: 700
src: local('Arimo Bold'), local('Arimo-Bold'), url(https://fonts.gstatic.com/s/arimo/v9/27rE5lMk9EHpLbxiIuGd0PesZW2xOQ-xsNqO47m55DA.woff2) format('woff2')
unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2212, U+2215
}
/* cyrillic-ext */
@font-face {
font-family: 'Arimo'
font-style: italic
font-weight: 400
src: local('Arimo Italic'), local('Arimo-Italic'), url(https://fonts.gstatic.com/s/arimo/v9/-lqiBwxkYHykb59Lvn7rk_Y6323mHUZFJMgTvxaG2iE.woff2) format('woff2')
unicode-range: U+0460-052F, U+20B4, U+2DE0-2DFF, U+A640-A69F
}
/* cyrillic */
@font-face {
font-family: 'Arimo'
font-style: italic
font-weight: 400
src: local('Arimo Italic'), local('Arimo-Italic'), url(https://fonts.gstatic.com/s/arimo/v9/tvCMF1Qlf0MEvcc7JEzrhfY6323mHUZFJMgTvxaG2iE.woff2) format('woff2')
unicode-range: U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116
}
/* greek-ext */
@font-face {
font-family: 'Arimo'
font-style: italic
font-weight: 400
src: local('Arimo Italic'), local('Arimo-Italic'), url(https://fonts.gstatic.com/s/arimo/v9/aKQL0kir7sjNM0_YzHc9yvY6323mHUZFJMgTvxaG2iE.woff2) format('woff2')
unicode-range: U+1F00-1FFF
}
/* greek */
@font-face {
font-family: 'Arimo'
font-style: italic
font-weight: 400
src: local('Arimo Italic'), local('Arimo-Italic'), url(https://fonts.gstatic.com/s/arimo/v9/c6Ldt38oFMowvdIZIi9CaPY6323mHUZFJMgTvxaG2iE.woff2) format('woff2')
unicode-range: U+0370-03FF
}
/* hebrew */
@font-face {
font-family: 'Arimo'
font-style: italic
font-weight: 400
src: local('Arimo Italic'), local('Arimo-Italic'), url(https://fonts.gstatic.com/s/arimo/v9/awI6zBWVPE21rQLtkVDZpfY6323mHUZFJMgTvxaG2iE.woff2) format('woff2')
unicode-range: U+0590-05FF, U+20AA, U+25CC, U+FB1D-FB4F
}
/* vietnamese */
@font-face {
font-family: 'Arimo'
font-style: italic
font-weight: 400
src: local('Arimo Italic'), local('Arimo-Italic'), url(https://fonts.gstatic.com/s/arimo/v9/Phj51JGRBuPcxq7i7-qcHPY6323mHUZFJMgTvxaG2iE.woff2) format('woff2')
unicode-range: U+0102-0103, U+1EA0-1EF9, U+20AB
}
/* latin-ext */
@font-face {
font-family: 'Arimo'
font-style: italic
font-weight: 400
src: local('Arimo Italic'), local('Arimo-Italic'), url(https://fonts.gstatic.com/s/arimo/v9/-CSRdP_Aes2aBSIDGwIm6vY6323mHUZFJMgTvxaG2iE.woff2) format('woff2')
unicode-range: U+0100-024F, U+1E00-1EFF, U+20A0-20AB, U+20AD-20CF, U+2C60-2C7F, U+A720-A7FF
}
/* latin */
@font-face {
font-family: 'Arimo'
font-style: italic
font-weight: 400
src: local('Arimo Italic'), local('Arimo-Italic'), url(https://fonts.gstatic.com/s/arimo/v9/GYkAnzJvKnl5kOgLY6RO-w.woff2) format('woff2')
unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2212, U+2215
}
你可以复制上面的代码，然后保存为.css文件。
你可以到bootstrap的源码仓库（github）下载，历史版本都有。 附一个当前版本的地址：https://github.com/twbs/bootstrap/
附3.0的下载地址，你可以另存为，或者用下载工具。
https://raw.github.com/twbs/bootstrap/3.0.0-wip/assets/css/docs.css
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