diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2dd20cd..0cd819a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,7 +6,7 @@
 
 - Taxonomies have been rewritten from scratch to allow custom ones with RSS and pagination
 - `get_taxonomy_url` has been renamed to `get_taxonomy` and will now return the full taxonomy
-instead of just the URL
+instead of just the URL of a term
 
 ### Others
 - Fix `serve` not working with the config flag
@@ -21,6 +21,7 @@ instead of just the URL
 - Add image resizing support
 - Add a 404 template
 - Enable preserve-order feature of Tera
+- Add an external link checker
 
 ## 0.3.4 (2018-06-22)
 
diff --git a/Cargo.lock b/Cargo.lock
index 37e6fa6..1c65c24 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -52,7 +52,7 @@ dependencies = [
  "rand 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.70 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_urlencoded 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "sha1 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -209,6 +209,11 @@ name = "bitflags"
 version = "1.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "build_const"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "bytecount"
 version = "0.3.1"
@@ -242,7 +247,7 @@ dependencies = [
  "semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.70 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.70 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.24 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -333,6 +338,31 @@ dependencies = [
  "url 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "core-foundation"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "core-foundation-sys 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.42 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "core-foundation-sys"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.42 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crc"
+version = "1.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "build_const 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "crossbeam-channel"
 version = "0.1.3"
@@ -462,7 +492,7 @@ dependencies = [
  "rust-stemmers 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.70 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.70 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "strum 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "strum_macros 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -524,6 +554,14 @@ name = "encoding_index_tests"
 version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "encoding_rs"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "error-chain"
 version = "0.1.12"
@@ -609,6 +647,19 @@ name = "fnv"
 version = "1.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "foreign-types"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "foreign-types-shared 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "foreign-types-shared"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "front_matter"
 version = "0.1.0"
@@ -816,6 +867,46 @@ name = "humansize"
 version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "hyper"
+version = "0.11.27"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "base64 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-cpupool 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "httparse 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "language-tags 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mime 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "net2 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)",
+ "percent-encoding 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "relay 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "time 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-core 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-proto 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-service 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicase 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "want 0.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "hyper-tls"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.11.27 (registry+https://github.com/rust-lang/crates.io-index)",
+ "native-tls 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-core 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-service 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-tls 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "idna"
 version = "0.1.5"
@@ -926,6 +1017,11 @@ name = "language-tags"
 version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "lazy_static"
+version = "0.2.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "lazy_static"
 version = "1.0.2"
@@ -941,6 +1037,24 @@ name = "libc"
 version = "0.2.42"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "libflate"
+version = "0.1.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "adler32 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crc 1.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "link_checker"
+version = "0.1.0"
+dependencies = [
+ "lazy_static 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "reqwest 0.8.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "linked-hash-map"
 version = "0.4.2"
@@ -999,7 +1113,7 @@ dependencies = [
  "phf_codegen 0.7.22 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.70 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.70 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "string_cache 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "string_cache_codegen 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "tendril 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1117,6 +1231,20 @@ dependencies = [
  "ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "native-tls"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "lazy_static 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.42 (registry+https://github.com/rust-lang/crates.io-index)",
+ "openssl 0.9.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "schannel 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "security-framework 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "security-framework-sys 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "net2"
 version = "0.2.33"
@@ -1263,6 +1391,29 @@ dependencies = [
  "pkg-config 0.3.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "openssl"
+version = "0.9.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bitflags 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "foreign-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.42 (registry+https://github.com/rust-lang/crates.io-index)",
+ "openssl-sys 0.9.33 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "openssl-sys"
+version = "0.9.33"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cc 1.0.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.42 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pkg-config 0.3.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "vcpkg 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "os_pipe"
 version = "0.6.1"
@@ -1566,6 +1717,14 @@ dependencies = [
  "ucd-util 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "relay"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "remove_dir_all"
 version = "0.5.1"
@@ -1582,6 +1741,7 @@ dependencies = [
  "errors 0.1.0",
  "front_matter 0.1.0",
  "highlighting 0.1.0",
+ "link_checker 0.1.0",
  "pest 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "pest_derive 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "pulldown-cmark 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1594,6 +1754,30 @@ dependencies = [
  "utils 0.1.0",
 ]
 
+[[package]]
+name = "reqwest"
+version = "0.8.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bytes 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "encoding_rs 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.11.27 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper-tls 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libflate 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mime_guess 2.0.0-alpha.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "native-tls 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.70 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_urlencoded 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-core 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-tls 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "uuid 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "resolv-conf"
 version = "0.6.1"
@@ -1649,6 +1833,15 @@ dependencies = [
  "pkg-config 0.3.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "schannel"
+version = "0.1.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "lazy_static 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "scoped-tls"
 version = "0.1.2"
@@ -1675,6 +1868,26 @@ dependencies = [
  "lazy_static 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "security-framework"
+version = "0.1.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "core-foundation 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "core-foundation-sys 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.42 (registry+https://github.com/rust-lang/crates.io-index)",
+ "security-framework-sys 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "security-framework-sys"
+version = "0.1.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "core-foundation-sys 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.42 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "semver"
 version = "0.9.0"
@@ -1706,7 +1919,7 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.22"
+version = "1.0.24"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "dtoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1779,7 +1992,7 @@ dependencies = [
  "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "pulldown-cmark 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "walkdir 2.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1807,6 +2020,11 @@ dependencies = [
  "unidecode 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "smallvec"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "smallvec"
 version = "0.6.2"
@@ -1946,11 +2164,16 @@ dependencies = [
  "regex-syntax 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.70 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.70 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "walkdir 2.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "yaml-rust 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "take"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "taxonomies"
 version = "0.1.0"
@@ -2027,7 +2250,7 @@ dependencies = [
  "pest_derive 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.70 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "slug 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "url 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -2159,6 +2382,23 @@ dependencies = [
  "log 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "tokio-proto"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "net2 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "slab 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "take 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-core 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-service 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "tokio-reactor"
 version = "0.1.2"
@@ -2172,6 +2412,14 @@ dependencies = [
  "tokio-io 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "tokio-service"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "tokio-signal"
 version = "0.1.5"
@@ -2221,6 +2469,17 @@ dependencies = [
  "tokio-executor 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "tokio-tls"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "native-tls 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-core 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "tokio-udp"
 version = "0.1.1"
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@@ -2704,6 +3003,7 @@ dependencies = [
 "checksum synom 0.11.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a393066ed9010ebaed60b9eafa373d4b1baac186dd7e008555b0f702b51945b6"
 "checksum synstructure 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)" = "3a761d12e6d8dcb4dcf952a7a89b475e3a9d69e4a69307e01a470977642914bd"
 "checksum syntect 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "dc8a6f0db88d4afc340522c20d260411e746b2225b257c6b238a75de9d7cec78"
+"checksum take 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b157868d8ac1f56b64604539990685fa7611d8fa9e5476cf0c02cf34d32917c5"
 "checksum tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)" = "15f2b5fb00ccdf689e0149d1b1b3c03fead81c2b37735d812fa8bddbbf41b6d8"
 "checksum tempfile 3.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "47776f63b85777d984a50ce49d6b9e58826b6a3766a449fc95bc66cd5663c15b"
 "checksum tendril 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "9de21546595a0873061940d994bbbc5c35f024ae4fd61ec5c5b159115684f508"
@@ -2720,15 +3020,19 @@ dependencies = [
 "checksum tokio-executor 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "8cac2a7883ff3567e9d66bb09100d09b33d90311feca0206c7ca034bc0c55113"
 "checksum tokio-fs 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "40697ecbea5660df15b15d50a077386477d2f6a35002adf01ce76ff9dd9dce48"
 "checksum tokio-io 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)" = "a5c9635ee806f26d302b8baa1e145689a280d8f5aa8d0552e7344808da54cc21"
+"checksum tokio-proto 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "8fbb47ae81353c63c487030659494b295f6cb6576242f907f203473b191b0389"
 "checksum tokio-reactor 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e00ec63bbec2c97ce1178cb0587b2c438b2f6b09d3ee54a33c45a9cf0d530810"
+"checksum tokio-service 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "24da22d077e0f15f55162bdbdc661228c1581892f52074fb242678d015b45162"
 "checksum tokio-signal 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "e8f46863230f9a05cf52d173721ec391b9c5782a2465f593029922b8782b9ffe"
 "checksum tokio-tcp 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ec9b094851aadd2caf83ba3ad8e8c4ce65a42104f7b94d9e6550023f0407853f"
 "checksum tokio-threadpool 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "24ab84f574027b0e875378f31575cf175360891919e93a3490f07e76e00e4efb"
 "checksum tokio-timer 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)" = "028b94314065b90f026a21826cffd62a4e40a92cda3e5c069cc7b02e5945f5e9"
+"checksum tokio-tls 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "772f4b04e560117fe3b0a53e490c16ddc8ba6ec437015d91fa385564996ed913"
 "checksum tokio-udp 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "43eb534af6e8f37d43ab1b612660df14755c42bd003c5f8d2475ee78cc4600c0"
 "checksum toml 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)" = "a0263c6c02c4db6c8f7681f9fd35e90de799ebd4cfdeab77a38f4ff6b3d8c0d9"
 "checksum trust-dns-proto 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "cbbddb93547eeee847367d8f59b68002294a7b4df31c143fbee4109ce0c61a04"
 "checksum trust-dns-resolver 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)" = "9b0a0c9d4f8dd56481209c5ae1a8965ed022461d352c81fb92466ec9d846929e"
+"checksum try-lock 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ee2aa4715743892880f70885373966c83d73ef1b0838a664ef0c76fffd35e7c2"
 "checksum ucd-util 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "fd2be2d6639d0f8fe6cdda291ad456e23629558d466e2789d2c3e9892bda285d"
 "checksum unicase 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7f4765f83163b74f957c797ad9253caf97f103fb064d3999aea9568d09fc8a33"
 "checksum unicase 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "284b6d3db520d67fbe88fd778c21510d1b0ba4a551e5d0fbb023d33405f6de8a"
@@ -2744,10 +3048,12 @@ dependencies = [
 "checksum utf-8 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f1262dfab4c30d5cb7c07026be00ee343a6cf5027fdc0104a9160f354e5db75c"
 "checksum utf8-ranges 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "662fab6525a98beff2921d7f61a39e7d59e0b425ebc7d0d9e66d316e55124122"
 "checksum uuid 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)" = "e1436e58182935dcd9ce0add9ea0b558e8a87befe01c1a301e6020aeb0876363"
+"checksum vcpkg 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)" = "cbe533e138811704c0e3cbde65a818b35d3240409b4346256c5ede403e082474"
 "checksum vec_map 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "05c78687fb1a80548ae3250346c3db86a80a7cdd77bda190189f2d0a0987c81a"
 "checksum version_check 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "7716c242968ee87e5542f8021178248f267f295a5c4803beae8b8b7fd9bc6051"
 "checksum void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
 "checksum walkdir 2.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "63636bd0eb3d00ccb8b9036381b526efac53caf112b7783b730ab3f8e44da369"
+"checksum want 0.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "a05d9d966753fa4b5c8db73fcab5eed4549cfe0e1e4e66911e5564a0085c35d1"
 "checksum widestring 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7157704c2e12e3d2189c507b7482c52820a16dfa4465ba91add92f266667cadb"
 "checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
 "checksum winapi 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "773ef9dcc5f24b7d850d0ff101e542ff24c3b090a9768e03ff889fdef41f00fd"
diff --git a/Cargo.toml b/Cargo.toml
index 9adabaa..aa9c37c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -53,4 +53,5 @@ members = [
     "components/utils",
     "components/search",
     "components/imageproc",
+    "components/link_checker",
 ]
diff --git a/components/config/src/lib.rs b/components/config/src/lib.rs
index 3efa7ab..46a4109 100644
--- a/components/config/src/lib.rs
+++ b/components/config/src/lib.rs
@@ -104,6 +104,9 @@ pub struct Config {
     #[serde(skip_serializing, skip_deserializing)]  // not a typo, 2 are needed
     pub ignored_content_globset: Option<GlobSet>,
 
+    /// Whether to check all external links for validity
+    pub check_external_links: bool,
+
     /// All user params set in [extra] in the config
     pub extra: HashMap<String, Toml>,
 
@@ -225,6 +228,7 @@ impl Default for Config {
             rss_limit: 10_000,
             taxonomies: Vec::new(),
             compile_sass: false,
+            check_external_links: false,
             build_search_index: false,
             ignored_content: Vec::new(),
             ignored_content_globset: None,
diff --git a/components/link_checker/Cargo.toml b/components/link_checker/Cargo.toml
new file mode 100644
index 0000000..92b49b0
--- /dev/null
+++ b/components/link_checker/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "link_checker"
+version = "0.1.0"
+authors = ["Vincent Prouillet <prouillet.vincent@gmail.com>"]
+
+[dependencies]
+reqwest = "0.8"
+lazy_static = "1"
diff --git a/components/link_checker/src/lib.rs b/components/link_checker/src/lib.rs
new file mode 100644
index 0000000..4d2d332
--- /dev/null
+++ b/components/link_checker/src/lib.rs
@@ -0,0 +1,88 @@
+extern crate reqwest;
+#[macro_use]
+extern crate lazy_static;
+
+use std::collections::HashMap;
+use std::error::Error;
+use std::sync::{Arc, RwLock};
+use reqwest::{StatusCode};
+
+
+#[derive(Clone, Debug, PartialEq)]
+pub struct LinkResult {
+    pub code: Option<StatusCode>,
+    /// Whether the HTTP request didn't make it to getting a HTTP code
+    pub error: Option<String>,
+}
+
+impl LinkResult {
+    pub fn is_valid(&self) -> bool {
+        if self.error.is_some() {
+            return false;
+        }
+
+        if let Some(c) = self.code {
+            return c.is_success();
+        }
+
+        true
+    }
+
+    pub fn message(&self) -> String {
+        if let Some(ref e) = self.error {
+            return e.clone();
+        }
+
+        if let Some(c) = self.code {
+            return format!("{}", c);
+        }
+
+        "Unknown error".to_string()
+    }
+}
+
+lazy_static! {
+    // Keep history of link checks so a rebuild doesn't have to check again
+    static ref LINKS: Arc<RwLock<HashMap<String, LinkResult>>> = Arc::new(RwLock::new(HashMap::new()));
+}
+
+pub fn check_url(url: &str) -> LinkResult {
+    {
+       let guard = LINKS.read().unwrap();
+        if let Some(res) = guard.get(url) {
+            return res.clone();
+        }
+    }
+
+    // Need to actually do the link checking
+    let res = match reqwest::get(url) {
+        Ok(response) => LinkResult { code: Some(response.status()), error: None },
+        Err(e) => LinkResult { code: None, error: Some(e.description().to_string()) },
+    };
+
+    LINKS.write().unwrap().insert(url.to_string(), res.clone());
+    return res;
+}
+
+#[cfg(test)]
+mod tests {
+    use super::{LINKS, check_url};
+
+    #[test]
+    fn can_validate_ok_links() {
+        let url = "https://google.com";
+        let res = check_url(url);
+        assert!(res.is_valid());
+        assert!(LINKS.read().unwrap().get(url).is_some());
+        let res = check_url(url);
+        assert!(res.is_valid());
+    }
+
+    #[test]
+    fn can_fail_404_links() {
+        let res = check_url("https://google.comys");
+        assert_eq!(res.is_valid(), false);
+        assert!(res.code.is_none());
+        assert!(res.error.is_some());
+    }
+}
diff --git a/components/rendering/Cargo.toml b/components/rendering/Cargo.toml
index c3c2e97..22a6e6f 100644
--- a/components/rendering/Cargo.toml
+++ b/components/rendering/Cargo.toml
@@ -18,6 +18,7 @@ front_matter = { path = "../front_matter" }
 highlighting = { path = "../highlighting"}
 utils = { path = "../utils" }
 config = { path = "../config" }
+link_checker = { path = "../link_checker" }
 
 [dev-dependencies]
 templates = { path = "../templates" }
diff --git a/components/rendering/src/lib.rs b/components/rendering/src/lib.rs
index 9c5da90..540b021 100644
--- a/components/rendering/src/lib.rs
+++ b/components/rendering/src/lib.rs
@@ -15,6 +15,7 @@ extern crate front_matter;
 extern crate highlighting;
 extern crate utils;
 extern crate config;
+extern crate link_checker;
 
 #[cfg(test)]
 extern crate templates;
diff --git a/components/rendering/src/markdown.rs b/components/rendering/src/markdown.rs
index c0694b8..9ceda56 100644
--- a/components/rendering/src/markdown.rs
+++ b/components/rendering/src/markdown.rs
@@ -9,6 +9,7 @@ use syntect::html::{start_coloured_html_snippet, styles_to_coloured_html, Includ
 use errors::Result;
 use utils::site::resolve_internal_link;
 use highlighting::{get_highlighter, THEME_SET};
+use link_checker::check_url;
 
 use table_of_contents::{TempHeader, Header, make_table_of_contents};
 use context::RenderContext;
@@ -138,7 +139,20 @@ pub fn markdown_to_html(content: &str, context: &RenderContext) -> Result<(Strin
                     } else if is_colocated_asset_link(&link) {
                         format!("{}{}", context.current_page_permalink, link)
                     } else {
-                        link.to_string()
+                        if context.config.check_external_links && !link.starts_with('#') {
+                            println!("Checking Link {}", link);
+                            let res = check_url(&link);
+                            if res.is_valid() {
+                                link.to_string()
+                            } else {
+                                error = Some(
+                                    format!("Link {} is not valid: {}", link, res.message()).into()
+                                );
+                                String::new()
+                            }
+                        } else {
+                            link.to_string()
+                        }
                     };
 
                     if in_header {
diff --git a/components/rendering/tests/markdown.rs b/components/rendering/tests/markdown.rs
index eda4036..e4d50c1 100644
--- a/components/rendering/tests/markdown.rs
+++ b/components/rendering/tests/markdown.rs
@@ -537,3 +537,28 @@ Some text
         "<p>Some text</p>\n<h1>Helo</h1>\n<div>\n<a href=\"mobx-flow.png\">\n        <img src=\"mobx-flow.png\" alt=\"MobX flow\">\n    </a>\n</div>\n"
     );
 }
+
+#[test]
+fn can_validate_valid_external_links() {
+    let permalinks_ctx = HashMap::new();
+    let mut config = Config::default();
+    config.check_external_links = true;
+    let context = RenderContext::new(&GUTENBERG_TERA, &config, "https://vincent.is/about/", &permalinks_ctx, InsertAnchor::None);
+    let res = render_content("[a link](http://google.com)", &context).unwrap();
+    assert_eq!(
+        res.0,
+        "<p><a href=\"http://google.com\">a link</a></p>\n"
+    );
+}
+
+#[test]
+fn can_show_error_message_for_invalid_external_links() {
+    let permalinks_ctx = HashMap::new();
+    let mut config = Config::default();
+    config.check_external_links = true;
+    let context = RenderContext::new(&GUTENBERG_TERA, &config, "https://vincent.is/about/", &permalinks_ctx, InsertAnchor::None);
+    let res = render_content("[a link](http://google.comy)", &context);
+    assert!(res.is_err());
+    let err = res.unwrap_err();
+    assert!(err.description().contains("Link http://google.comy is not valid"));
+}
diff --git a/docs/content/documentation/getting-started/configuration.md b/docs/content/documentation/getting-started/configuration.md
index d552d87..7a0ce6b 100644
--- a/docs/content/documentation/getting-started/configuration.md
+++ b/docs/content/documentation/getting-started/configuration.md
@@ -56,6 +56,12 @@ compile_sass = false
 # content for the `default_language`
 build_search_index = false
 
+# Go through every links in all content and check if the links are valid
+# If a link is invalid (404, 500, etc), the build will error.
+# Link checking can take a very long time if you have many links so this should
+# only enabled once in a while to catch any dead links.
+check_external_links = false
+
 # A list of glob patterns specifying asset files to ignore when
 # processing the content directory.
 # Defaults to none, which means all asset files are copied over to the public folder.