Running examples in 'rvest-Ex.R' failed
The error most likely occurred in:

> ### Name: html_table
> ### Title: Parse an html table into a data frame.
> ### Aliases: html_table
> 
> ### ** Examples
> 
> tdist <- read_html("http://en.wikipedia.org/wiki/Student%27s_t-distribution")
> tdist %>%
+   html_node("table.infobox") %>%
+   html_table(header = FALSE)
                                 X1
1      Probability density function
2  Cumulative distribution function
3                        Parameters
4                           Support
5                               PDF
6                               CDF
7                              Mean
8                            Median
9                              Mode
10                         Variance
11                         Skewness
12                     Ex. kurtosis
13                          Entropy
14                              MGF
15                               CF
                                                                                                                                                                                                                                                                                                                                                                                                                                                              X2
1                                                                                                                                                                                                                                                                                                                                                                                                                                   Probability density function
2                                                                                                                                                                                                                                                                                                                                                                                                                               Cumulative distribution function
3                                                                                                                                                                                                                                                                                                                                                                                                   <U+03BD>>0{\\displaystyle \\nu >0} degrees of freedom (real)
4                                                                                                                                                                                                                                                                                                                                                                                                                                            x <U+2208> (-8; +8)
5                                                                                                                                                                      G(<U+03BD>+12)<U+03BD>pG(<U+03BD>2)(1+x2<U+03BD>)-<U+03BD>+12{\\displaystyle \\textstyle {\\frac {\\Gamma \\left({\\frac {\\nu +1}{2}}\\right)}{{\\sqrt {\\nu \\pi }}\\,\\Gamma \\left({\\frac {\\nu }{2}}\\right)}}\\left(1+{\\frac {x^{2}}{\\nu }}\\right)^{-{\\frac {\\nu +1}{2}}}\\!}
6                    12+xG(<U+03BD>+12)×2F1(12,<U+03BD>+12;32;-x2<U+03BD>)p<U+03BD>G(<U+03BD>2){\\displaystyle {\\begin{matrix}{\\frac {1}{2}}+x\\Gamma \\left({\\frac {\\nu +1}{2}}\\right)\\times \\\\[0.5em]{\\frac {\\,_{2}F_{1}\\left({\\frac {1}{2}},{\\frac {\\nu +1}{2}};{\\frac {3}{2}};-{\\frac {x^{2}}{\\nu }}\\right)}{{\\sqrt {\\pi \\nu }}\\,\\Gamma \\left({\\frac {\\nu }{2}}\\right)}}\\end{matrix}}}\nwhere 2F1 is the hypergeometric function
7                                                                                                                                                                                                                                                                                                                                                                                                  0 for <U+03BD>>1{\\displaystyle \\nu >1}, otherwise undefined
8                                                                                                                                                                                                                                                                                                                                                                                                                                                              0
9                                                                                                                                                                                                                                                                                                                                                                                                                                                              0
10                                                                                                                                                                                                                                                                       <U+03BD><U+03BD>-2{\\displaystyle \\textstyle {\\frac {\\nu }{\\nu -2}}} for <U+03BD>>2{\\displaystyle \\nu >2}, 8 for 1<<U+03BD>=2{\\displaystyle 1<\\nu \\leq 2}, otherwise undefined
11                                                                                                                                                                                                                                                                                                                                                                                                 0 for <U+03BD>>3{\\displaystyle \\nu >3}, otherwise undefined
12                                                                                                                                                                                                                                                                                  6<U+03BD>-4{\\displaystyle \\textstyle {\\frac {6}{\\nu -4}}} for <U+03BD>>4{\\displaystyle \\nu >4}, 8 for 2<<U+03BD>=4{\\displaystyle 2<\\nu \\leq 4}, otherwise undefined
13 <U+03BD>+12[<U+03C8>(1+<U+03BD>2)-<U+03C8>(<U+03BD>2)]+ln<U+2061>[<U+03BD>B(<U+03BD>2,12)](nats){\\displaystyle {\\begin{matrix}{\\frac {\\nu +1}{2}}\\left[\\psi \\left({\\frac {1+\\nu }{2}}\\right)-\\psi \\left({\\frac {\\nu }{2}}\\right)\\right]\\\\[0.5em]+\\ln {\\left[{\\sqrt {\\nu }}B\\left({\\frac {\\nu }{2}},{\\frac {1}{2}}\\right)\\right]}\\,{\\scriptstyle {\\text{(nats)}}}\\end{matrix}}}\n<U+03C8>: digamma function,\nB: beta function
14                                                                                                                                                                                                                                                                                                                                                                                                                                                     undefined
15                                                                          K<U+03BD>/2(<U+03BD>|t|)·(<U+03BD>|t|)<U+03BD>/2G(<U+03BD>/2)2<U+03BD>/2-1{\\displaystyle \\textstyle {\\frac {K_{\\nu /2}\\left({\\sqrt {\\nu }}|t|\\right)\\cdot \\left({\\sqrt {\\nu }}|t|\\right)^{\\nu /2}}{\\Gamma (\\nu /2)2^{\\nu /2-1}}}} for <U+03BD>>0{\\displaystyle \\nu >0}\nK<U+03BD>(x){\\displaystyle K_{\\nu }(x)}: Modified Bessel function of the second kind[1]
> 
> births <- read_html("https://www.ssa.gov/oact/babynames/numberUSbirths.html")
Error in open.connection(x, "rb") : 
  OpenSSL SSL_connect: SSL_ERROR_SYSCALL in connection to www.ssa.gov:443 
Calls: read_html -> read_html.default
Execution halted