diff --git a/README.md b/README.md
index 706fd9ce..0fd12af8 100644
--- a/README.md
+++ b/README.md
@@ -300,8 +300,6 @@ The `HTMLProofer` constructor takes an optional hash of additional options:
 | `only_4xx` | Only reports errors for links that fall within the 4xx status code range. | `false` |
 | `root_dir` | The absolute path to the directory serving your html-files. | "" |
 | `swap_urls` | A hash containing key-value pairs of `RegExp => String`. It transforms URLs that match `RegExp` into `String` via `gsub`. | `{}` |
-| `typhoeus_config` | A JSON-formatted string. Parsed using `JSON.parse` and mapped on top of the default configuration values so that they can be overridden. | `{}` |
-
 
 In addition, there are a few "namespaced" options. These are:
 
@@ -337,6 +335,8 @@ The default value is:
 }
 ```
 
+On the CLI, you can provide the `--typhoeus` or `hydra` arguments. These are parsed using `JSON.parse` and mapped on top of the default configuration values so that they can be overridden.
+
 #### Setting `before-request` callback
 
 You can provide a block to set some logic before an external link is checked. For example, say you want to provide an authentication token every time a GitHub URL is checked. You can do that like this:
@@ -363,6 +363,8 @@ In this example, `in_processes: 3` is passed into Parallel as a configuration op
 
 Pass in `:parallel => { enable: false }` to disable parallel runs.
 
+On the CLI, you can provide the `--parallel` argument. This is parsed using `JSON.parse` and mapped on top of the default configuration values so that they can be overridden.
+
 ## Configuring caching
 
 Checking external URLs can slow your tests down. If you'd like to speed that up, you can enable caching for your external links. Caching simply means to skip links that are valid for a certain period of time.
@@ -398,6 +400,8 @@ The cache operates on external links only.
 
 If caching is enabled, HTMLProofer writes to a log file called *tmp/.htmlproofer/cache.log*. You should probably ignore this folder in your version control system.
 
+On the CLI, you can provide the `--timeframe` or `--storage-dir` arguments to control the cache behavior.
+
 ### Caching with continuous integration
 
 Enable caching in your continuous integration process. It will make your builds faster.
diff --git a/bin/htmlproofer b/bin/htmlproofer
index 74cd3b0c..5b7e3923 100755
--- a/bin/htmlproofer
+++ b/bin/htmlproofer
@@ -33,12 +33,14 @@ Mercenary.program(:htmlproofer) do |p|
   p.option 'ignore_urls', '--ignore-urls link1,[link2,...]', Array, 'A comma-separated list of Strings or RegExps containing URLs that are safe to ignore. This affects all HTML attributes, such as `alt` tags on images.'
   p.option 'log_level', '--log-level <level>', String, 'Sets the logging level, as determined by Yell. One of `:debug`, `:info`, `:warn`, `:error`, or `:fatal`. (default: `:info`)'
   p.option 'only_4xx', '--only-4xx', 'Only reports errors for links that fall within the 4xx status code range'
+  p.option 'root_dir', '--root-dir PATH', String, 'The absolute path to the directory serving your html-files.'
   p.option 'storage_dir', '--storage-dir PATH', String, 'Directory where to store the cache log (default: "tmp/.htmlproofer")'
-  p.option 'timeframe', '--timeframe <time>', String, 'A string representing the caching timeframe.'
-  p.option 'typhoeus_config', '--typhoeus-config CONFIG', String, 'JSON-formatted string of Typhoeus config. Will override the html-proofer defaults.'
-  p.option 'hydra_config', '--hydra-config CONFIG', String, 'JSON-formatted string of Hydra config. Will override the html-proofer defaults.'
   p.option 'swap_urls', '--swap-urls re:string,[re:string,...]', Array, 'A comma-separated list containing key-value pairs of `RegExp => String`. It transforms URLs that match `RegExp` into `String` via `gsub`. The escape sequences `\\:` should be used to produce literal `:`s.'
-  p.option 'root_dir', '--root-dir PATH', String, 'The absolute path to the directory serving your html-files.'
+  p.option 'timeframe', '--timeframe <time>', String, 'A string representing the caching timeframe.'
+
+  p.option 'typhoeus', '--typhoeus CONFIG', String, 'JSON-formatted string of Typhoeus config. Will override the html-proofer defaults.'
+  p.option 'hydra', '--hydra CONFIG', String, 'JSON-formatted string of Hydra config. Will override the html-proofer defaults.'
+  p.option 'parallel', '--parallel CONFIG', String, 'JSON-formatted string of Parallel config. Will override the html-proofer defaults.'
 
   p.action do |args, opts|
     args = ['.'] if args.empty?
@@ -66,8 +68,9 @@ Mercenary.program(:htmlproofer) do |p|
 
     options[:log_level] = opts['log_level'].to_sym unless opts['log_level'].nil?
 
-    options[:typhoeus] = HTMLProofer::Configuration.parse_json_option('typhoeus_config', opts['typhoeus_config'], symbolize_names: false) unless opts['typhoeus_config'].nil?
-    options[:hydra] = HTMLProofer::Configuration.parse_json_option('hydra_config', opts['hydra_config']) unless opts['hydra_config'].nil?
+    options[:typhoeus] = HTMLProofer::Configuration.parse_json_option('typhoeus', opts['typhoeus'], symbolize_names: false) unless opts['typhoeus'].nil?
+    options[:hydra] = HTMLProofer::Configuration.parse_json_option('hydra', opts['hydra']) unless opts['hydra'].nil?
+    options[:parallel] = HTMLProofer::Configuration.parse_json_option('parallel', opts['parallel']) unless opts['parallel'].nil?
 
     unless opts['timeframe'].nil?
       options[:cache] ||= {}
diff --git a/spec/html-proofer/command_spec.rb b/spec/html-proofer/command_spec.rb
index 9fd1aa4a..962fc799 100644
--- a/spec/html-proofer/command_spec.rb
+++ b/spec/html-proofer/command_spec.rb
@@ -88,17 +88,6 @@
     expect(output).to match('successfully')
   end
 
-  it 'has only one UA' do
-    http = make_bin(%|--typhoeus-config='{"verbose":true,"headers":{"User-Agent":"Mozilla/5.0 (Macintosh; My New User-Agent)"}}' --as-links https://linkedin.com|)
-    expect(http.scan(/User-Agent: Typhoeus/).count).to eq 0
-    expect(http.scan(%r{User-Agent: Mozilla/5.0 \(Macintosh; My New User-Agent\)}i).count).to eq 2
-  end
-
-  it 'accepts hydra max_concurrency' do
-    http = make_bin(%(--hydra-config '{"max_concurrency": 5}' http://www.github.com --as-links))
-    expect(http.scan(/max_concurrency is invalid/).count).to eq 0
-  end
-
   it 'navigates above itself in a subdirectory' do
     real_link = File.join(FIXTURES_DIR, 'links', 'root_folder/documentation-from-my-project/')
     output = make_bin("--root-dir #{File.join(FIXTURES_DIR, 'links', 'root_folder/')} #{real_link}")
@@ -108,6 +97,25 @@
   it 'has every option for proofer defaults' do
     match_command_help(HTMLProofer::Configuration::PROOFER_DEFAULTS)
   end
+
+  context 'nested options' do
+    it 'supports typhoeus' do
+      link_with_redirect_filepath = File.join(FIXTURES_DIR, 'links', 'link_with_redirect.html')
+      output = make_bin("#{link_with_redirect_filepath} --typhoeus '{ \"followlocation\": false }'")
+      expect(output).to match(/failed: 301/)
+    end
+
+    it 'has only one UA' do
+      http = make_bin(%|--typhoeus='{"verbose":true,"headers":{"User-Agent":"Mozilla/5.0 (Macintosh; My New User-Agent)"}}' --as-links https://linkedin.com|)
+      expect(http.scan(/User-Agent: Typhoeus/).count).to eq 0
+      expect(http.scan(%r{User-Agent: Mozilla/5.0 \(Macintosh; My New User-Agent\)}i).count).to eq 2
+    end
+
+    it 'supports hydra' do
+      http = make_bin(%(--hydra '{"max_concurrency": 5}' http://www.github.com --as-links))
+      expect(http.scan(/max_concurrency is invalid/).count).to eq 0
+    end
+  end
 end
 
 def match_command_help(config)
diff --git a/spec/html-proofer/fixtures/cache/.runner.log b/spec/html-proofer/fixtures/cache/.runner.log
index 58ef296e..ee0c0f8a 100644
--- a/spec/html-proofer/fixtures/cache/.runner.log
+++ b/spec/html-proofer/fixtures/cache/.runner.log
@@ -1 +1 @@
-{"version":2,"internal":{"/somewhere.html":{"time":"2021-12-31 12:17:06 -0500","metadata":[{"source":"spec/html-proofer/fixtures/cache/internal_and_external_example.html","current_path":"spec/html-proofer/fixtures/cache/internal_and_external_example.html","line":11,"base_url":"","found":false}]}},"external":{"https://www.github.com":{"time":"2021-12-31 12:17:07 -0500","status":200,"message":"OK","metadata":[{"filename":"spec/html-proofer/fixtures/links/_site","line":4}]}}}
\ No newline at end of file
+{"version":2,"internal":{},"external":{"https://www.github.com":{"time":"2021-12-31 14:52:56 -0500","status":200,"message":"OK","metadata":[{"filename":"spec/html-proofer/fixtures/links/_site","line":4}]}}}
\ No newline at end of file
diff --git a/spec/html-proofer/fixtures/cache/version_2/.internal_and_external.log b/spec/html-proofer/fixtures/cache/version_2/.internal_and_external.log
index 1dc8d4db..f741fd7c 100644
--- a/spec/html-proofer/fixtures/cache/version_2/.internal_and_external.log
+++ b/spec/html-proofer/fixtures/cache/version_2/.internal_and_external.log
@@ -1 +1 @@
-{"version":2,"internal":{"/somewhere.html":{"time":"2021-12-31 12:18:59 -0500","metadata":[{"source":"spec/html-proofer/fixtures/cache/internal_and_external_example.html","current_path":"spec/html-proofer/fixtures/cache/internal_and_external_example.html","line":11,"base_url":"","found":false}]}},"external":{"https://github.com/gjtorikian/html-proofer":{"time":"2021-12-31 12:18:59 -0500","status":200,"message":"OK","metadata":[{"filename":"spec/html-proofer/fixtures/cache/internal_and_external_example.html","line":7}]}}}
\ No newline at end of file
+{"version":2,"internal":{"/somewhere.html":{"time":"2021-12-31 14:52:56 -0500","metadata":[{"source":"spec/html-proofer/fixtures/cache/internal_and_external_example.html","current_path":"spec/html-proofer/fixtures/cache/internal_and_external_example.html","line":11,"base_url":"","found":false}]}},"external":{"https://github.com/gjtorikian/html-proofer":{"time":"2021-12-31 14:52:56 -0500","status":200,"message":"OK","metadata":[{"filename":"spec/html-proofer/fixtures/cache/internal_and_external_example.html","line":7}]}}}
\ No newline at end of file
diff --git a/spec/html-proofer/fixtures/cache/version_2/.recheck_external_failure.log b/spec/html-proofer/fixtures/cache/version_2/.recheck_external_failure.log
index 44ad9647..f741fd7c 100644
--- a/spec/html-proofer/fixtures/cache/version_2/.recheck_external_failure.log
+++ b/spec/html-proofer/fixtures/cache/version_2/.recheck_external_failure.log
@@ -1 +1 @@
-{"version":2,"internal":{"/somewhere.html":{"time":"2021-12-31 12:18:59 -0500","metadata":[{"source":"spec/html-proofer/fixtures/cache/internal_and_external_example.html","current_path":"spec/html-proofer/fixtures/cache/internal_and_external_example.html","line":11,"base_url":"","found":false}]}},"external":{"https://github.com/gjtorikian/html-proofer":{"time":"2021-12-31 12:18:59 -0500","status":200,"message":"OK","metadata":[{"filename":"spec/html-proofer/fixtures/cache/external_example.html","line":7}]}}}
\ No newline at end of file
+{"version":2,"internal":{"/somewhere.html":{"time":"2021-12-31 14:52:56 -0500","metadata":[{"source":"spec/html-proofer/fixtures/cache/internal_and_external_example.html","current_path":"spec/html-proofer/fixtures/cache/internal_and_external_example.html","line":11,"base_url":"","found":false}]}},"external":{"https://github.com/gjtorikian/html-proofer":{"time":"2021-12-31 14:52:56 -0500","status":200,"message":"OK","metadata":[{"filename":"spec/html-proofer/fixtures/cache/internal_and_external_example.html","line":7}]}}}
\ No newline at end of file
diff --git a/spec/html-proofer/fixtures/cache/version_2/.removed_link.log b/spec/html-proofer/fixtures/cache/version_2/.removed_link.log
index 5899be4a..642a0e32 100644
--- a/spec/html-proofer/fixtures/cache/version_2/.removed_link.log
+++ b/spec/html-proofer/fixtures/cache/version_2/.removed_link.log
@@ -1 +1 @@
-{"version":2,"internal":{"/somewhere.html":{"time":"2021-12-31 12:18:59 -0500","metadata":[{"source":"spec/html-proofer/fixtures/cache/internal_and_external_example.html","current_path":"spec/html-proofer/fixtures/cache/internal_and_external_example.html","line":11,"base_url":"","found":false}]}},"external":{"https://github.com/gjtorikian":{"time":"2021-12-31 12:18:59 -0500","status":200,"message":"OK","metadata":[{"filename":"spec/html-proofer/fixtures/cache/some_link.html","line":7}]}}}
\ No newline at end of file
+{"version":2,"internal":{"/somewhere.html":{"time":"2021-12-31 14:52:56 -0500","metadata":[{"source":"spec/html-proofer/fixtures/cache/internal_and_external_example.html","current_path":"spec/html-proofer/fixtures/cache/internal_and_external_example.html","line":11,"base_url":"","found":false}]}},"external":{"https://github.com/gjtorikian":{"time":"2021-12-31 14:52:57 -0500","status":200,"message":"OK","metadata":[{"filename":"spec/html-proofer/fixtures/cache/some_link.html","line":7}]}}}
\ No newline at end of file
diff --git a/spec/html-proofer/fixtures/vcr_cassettes/cache/internal_and_external_example_html_cache_timeframe_1d_cache_file_version_2/_internal_and_external_log_storage_dir_spec/html-proofer/fixtures/cache_log_level_error_type_file_.yml b/spec/html-proofer/fixtures/vcr_cassettes/cache/internal_and_external_example_html_cache_timeframe_1d_cache_file_version_2/_internal_and_external_log_storage_dir_spec/html-proofer/fixtures/cache_log_level_error_type_file_.yml
new file mode 100644
index 00000000..60a44635
--- /dev/null
+++ b/spec/html-proofer/fixtures/vcr_cassettes/cache/internal_and_external_example_html_cache_timeframe_1d_cache_file_version_2/_internal_and_external_log_storage_dir_spec/html-proofer/fixtures/cache_log_level_error_type_file_.yml
@@ -0,0 +1,83 @@
+---
+http_interactions:
+- request:
+    method: head
+    uri: https://github.com/gjtorikian/html-proofer
+    body:
+      encoding: US-ASCII
+      string: ''
+    headers:
+      User-Agent:
+      - Mozilla/5.0 (compatible; HTML Proofer/3.19.3; +https://github.com/gjtorikian/html-proofer)
+      Accept:
+      - application/xml,application/xhtml+xml,text/html;q=0.9, text/plain;q=0.8,image/png,*/*;q=0.5
+      Expect:
+      - ''
+  response:
+    status:
+      code: 200
+      message: ''
+    headers:
+      server:
+      - GitHub.com
+      date:
+      - Fri, 31 Dec 2021 19:52:57 GMT
+      content-type:
+      - text/html; charset=utf-8
+      vary:
+      - X-PJAX, X-PJAX-Container, Accept-Encoding, Accept, X-Requested-With
+      permissions-policy:
+      - interest-cohort=()
+      etag:
+      - W/"8c87e62dbc504dc41105986d681c9fe2"
+      cache-control:
+      - max-age=0, private, must-revalidate
+      strict-transport-security:
+      - max-age=31536000; includeSubdomains; preload
+      x-frame-options:
+      - deny
+      x-content-type-options:
+      - nosniff
+      x-xss-protection:
+      - '0'
+      referrer-policy:
+      - no-referrer-when-downgrade
+      expect-ct:
+      - max-age=2592000, report-uri="https://api.github.com/_private/browser/errors"
+      content-security-policy:
+      - 'default-src ''none''; base-uri ''self''; block-all-mixed-content; child-src
+        github.com/assets-cdn/worker/ gist.github.com/assets-cdn/worker/; connect-src
+        ''self'' uploads.github.com objects-origin.githubusercontent.com www.githubstatus.com
+        collector.githubapp.com api.github.com github-cloud.s3.amazonaws.com github-production-repository-file-5c1aeb.s3.amazonaws.com
+        github-production-upload-manifest-file-7fdce7.s3.amazonaws.com github-production-user-asset-6210df.s3.amazonaws.com
+        cdn.optimizely.com logx.optimizely.com/v1/events translator.github.com wss://alive.github.com
+        *.actions.githubusercontent.com wss://*.actions.githubusercontent.com online.visualstudio.com/api/v1/locations
+        raw.githubusercontent.com github-production-repository-image-32fea6.s3.amazonaws.com
+        github-production-release-asset-2e65be.s3.amazonaws.com insights.github.com;
+        font-src github.githubassets.com; form-action ''self'' github.com gist.github.com
+        objects-origin.githubusercontent.com; frame-ancestors ''none''; frame-src
+        render.githubusercontent.com viewscreen.githubusercontent.com notebooks.githubusercontent.com;
+        img-src ''self'' data: github.githubassets.com identicons.github.com collector.githubapp.com
+        github-cloud.s3.amazonaws.com secured-user-images.githubusercontent.com/ *.githubusercontent.com;
+        manifest-src ''self''; media-src github.com user-images.githubusercontent.com/;
+        script-src github.githubassets.com; style-src ''unsafe-inline'' github.githubassets.com;
+        worker-src github.com/assets-cdn/worker/ gist.github.com/assets-cdn/worker/'
+      set-cookie:
+      - _gh_sess=3KnuZ4K9cqtosmLmKbp5CKHdSwbPVLKOJw%2Bv%2FRKjx1sPDCtZw8M4bSZgU8CfTEveaRw%2Fe7K%2FNT%2F%2FQdpknbmb9ZUmE%2Fo17wa3pJpfj2BQ8TbvQJTrWVrnSSnJvndKUZDl2x2LdyRWE59UsIYNT330udx6V4pWWkOiKzEYuTlwbuxfIm5asF0yuDzCmvBnjaO8pwGAbaESuk3G7srW3c3eJKUy7kj69zpUwHh%2Bb%2BZEtD%2BNM9elXrilQNoBRGwOc4nlsIYgJNd7Xw%2FdgKeYJHXd%2Fg%3D%3D--j0CFPbUcD0nZrX%2Bj--xQ6qUysXQ8xnLj0%2Bgq4eNQ%3D%3D;
+        Path=/; HttpOnly; Secure; SameSite=Lax
+      - _octo=GH1.1.1913527024.1640980377; Path=/; Domain=github.com; Expires=Sat,
+        31 Dec 2022 19:52:57 GMT; Secure; SameSite=Lax
+      - logged_in=no; Path=/; Domain=github.com; Expires=Sat, 31 Dec 2022 19:52:57
+        GMT; HttpOnly; Secure; SameSite=Lax
+      accept-ranges:
+      - bytes
+      x-github-request-id:
+      - 133A:4086:243EB23:3A1A52B:61CF5F98
+    body:
+      encoding: ASCII-8BIT
+      string: ''
+    http_version: '2'
+    adapter_metadata:
+      effective_url: https://github.com/gjtorikian/html-proofer
+  recorded_at: Fri, 31 Dec 2021 19:52:57 GMT
+recorded_with: VCR 2.9.3