diff --git a/docs/change-log.md b/docs/change-log.md
index 74531135..89cbe17c 100644
--- a/docs/change-log.md
+++ b/docs/change-log.md
@@ -1,5 +1,7 @@
 # Change log
 
+- [v1.1.5](#v115)
+- [v1.1.4](#v114)
 - [v1.1.3](#v113)
 - [v1.1.2](#v112)
 - [v1.1.1](#v111)
@@ -10,11 +12,16 @@
 
 ---
 
+### v1.1.5
+
+- API: If a user sets the Content-Type header within a request's options, that value will be the entire header value rather than being appended to the default value ([#1924](https://github.com/MithrilJS/mithril.js/pull/1924))
+
+---
+
 ### v1.1.4
 
 #### Bug fixes:
-- Fix IE bug where active element is null causing render function to throw error. ([1943](https://github.com/MithrilJS/mithril.js/pull/1943))
-
+- Fix IE bug where active element is null causing render function to throw error. ([1943]
 ---
 
 ### v1.1.3
diff --git a/package-lock.json b/package-lock.json
index 8beb93c6..b4faf127 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2,6 +2,7 @@
   "name": "mithril",
   "version": "1.1.4",
   "lockfileVersion": 1,
+  "requires": true,
   "dependencies": {
     "@alrra/travis-scripts": {
       "version": "3.0.1",
@@ -23,6 +24,9 @@
       "version": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-3.0.1.tgz",
       "integrity": "sha1-r9+UiPsezvyDSPb7IvRk4ypYs2s=",
       "dev": true,
+      "requires": {
+        "acorn": "https://registry.npmjs.org/acorn/-/acorn-3.3.0.tgz"
+      },
       "dependencies": {
         "acorn": {
           "version": "https://registry.npmjs.org/acorn/-/acorn-3.3.0.tgz",
@@ -34,7 +38,11 @@
     "ajv": {
       "version": "https://registry.npmjs.org/ajv/-/ajv-4.11.8.tgz",
       "integrity": "sha1-gv+wKynmYq5TvcIK8VlHcGc5xTY=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "co": "https://registry.npmjs.org/co/-/co-4.6.0.tgz",
+        "json-stable-stringify": "https://registry.npmjs.org/json-stable-stringify/-/json-stable-stringify-1.0.1.tgz"
+      }
     },
     "ajv-keywords": {
       "version": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-1.5.1.tgz",
@@ -44,12 +52,18 @@
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       "version": "https://registry.npmjs.org/align-text/-/align-text-0.1.4.tgz",
       "integrity": "sha1-DNkKVhCT810KmSVsIrcGlDP60Rc=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "kind-of": "https://registry.npmjs.org/kind-of/-/kind-of-3.2.0.tgz",
+        "longest": "https://registry.npmjs.org/longest/-/longest-1.0.1.tgz",
+        "repeat-string": "https://registry.npmjs.org/repeat-string/-/repeat-string-1.6.1.tgz"
+      }
     },
     "amdefine": {
       "version": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
       "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "ansi-escapes": {
       "version": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-1.4.0.tgz",
@@ -69,12 +83,18 @@
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       "version": "https://registry.npmjs.org/argparse/-/argparse-1.0.9.tgz",
       "integrity": "sha1-c9g7wmP4bpf4zE9rrhsOkKfSLIY=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "sprintf-js": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz"
+      }
     },
     "array-union": {
       "version": "https://registry.npmjs.org/array-union/-/array-union-1.0.2.tgz",
       "integrity": "sha1-mjRBDk9OPaI96jdb5b5w8kd47Dk=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "array-uniq": "https://registry.npmjs.org/array-uniq/-/array-uniq-1.0.3.tgz"
+      }
     },
     "array-uniq": {
       "version": "https://registry.npmjs.org/array-uniq/-/array-uniq-1.0.3.tgz",
@@ -94,7 +114,12 @@
     "babel-code-frame": {
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       "integrity": "sha1-AnYgvuVnqIwyVhV05/0IAdMxGOQ=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "chalk": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+        "esutils": "https://registry.npmjs.org/esutils/-/esutils-2.0.2.tgz",
+        "js-tokens": "https://registry.npmjs.org/js-tokens/-/js-tokens-3.0.1.tgz"
+      }
     },
     "balanced-match": {
       "version": "https://registry.npmjs.org/balanced-match/-/balanced-match-0.4.2.tgz",
@@ -104,12 +129,20 @@
     "benchmark": {
       "version": "https://registry.npmjs.org/benchmark/-/benchmark-2.1.4.tgz",
       "integrity": "sha1-CfPeMckWQl1JjMLuVloOvzwqVik=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "lodash": "https://registry.npmjs.org/lodash/-/lodash-4.17.4.tgz",
+        "platform": "https://registry.npmjs.org/platform/-/platform-1.3.4.tgz"
+      }
     },
     "brace-expansion": {
       "version": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.7.tgz",
       "integrity": "sha1-Pv/DxQ4ABTH7cg6v+A8K6O8jz1k=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "balanced-match": "https://registry.npmjs.org/balanced-match/-/balanced-match-0.4.2.tgz",
+        "concat-map": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz"
+      }
     },
     "buffer-shims": {
       "version": "https://registry.npmjs.org/buffer-shims/-/buffer-shims-1.0.0.tgz",
@@ -119,7 +152,10 @@
     "caller-path": {
       "version": "https://registry.npmjs.org/caller-path/-/caller-path-0.1.0.tgz",
       "integrity": "sha1-lAhe9jWB7NPaqSREqP6U6CV3dR8=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "callsites": "https://registry.npmjs.org/callsites/-/callsites-0.2.0.tgz"
+      }
     },
     "callsites": {
       "version": "https://registry.npmjs.org/callsites/-/callsites-0.2.0.tgz",
@@ -136,12 +172,23 @@
       "version": "https://registry.npmjs.org/center-align/-/center-align-0.1.3.tgz",
       "integrity": "sha1-qg0yYptu6XIgBBHL1EYckHvCt60=",
       "dev": true,
-      "optional": true
+      "optional": true,
+      "requires": {
+        "align-text": "https://registry.npmjs.org/align-text/-/align-text-0.1.4.tgz",
+        "lazy-cache": "https://registry.npmjs.org/lazy-cache/-/lazy-cache-1.0.4.tgz"
+      }
     },
     "chalk": {
       "version": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
       "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "ansi-styles": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
+        "escape-string-regexp": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
+        "has-ansi": "https://registry.npmjs.org/has-ansi/-/has-ansi-2.0.0.tgz",
+        "strip-ansi": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+        "supports-color": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz"
+      }
     },
     "circular-json": {
       "version": "https://registry.npmjs.org/circular-json/-/circular-json-0.3.1.tgz",
@@ -151,7 +198,10 @@
     "cli-cursor": {
       "version": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-1.0.2.tgz",
       "integrity": "sha1-ZNo/fValRBLll5S9Ytw1KV6PKYc=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "restore-cursor": "https://registry.npmjs.org/restore-cursor/-/restore-cursor-1.0.1.tgz"
+      }
     },
     "cli-width": {
       "version": "https://registry.npmjs.org/cli-width/-/cli-width-2.1.0.tgz",
@@ -163,6 +213,11 @@
       "integrity": "sha1-S0dXYP+AJkx2LDoXGQMukcf+oNE=",
       "dev": true,
       "optional": true,
+      "requires": {
+        "center-align": "https://registry.npmjs.org/center-align/-/center-align-0.1.3.tgz",
+        "right-align": "https://registry.npmjs.org/right-align/-/right-align-0.1.3.tgz",
+        "wordwrap": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.2.tgz"
+      },
       "dependencies": {
         "wordwrap": {
           "version": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.2.tgz",
@@ -186,13 +241,19 @@
       "version": "0.2.2",
       "resolved": "https://registry.npmjs.org/collections/-/collections-0.2.2.tgz",
       "integrity": "sha1-HyMCay7zb5J+7MkB6ZxfDUj6M04=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "weak-map": "1.0.0"
+      }
     },
     "commander": {
       "version": "2.9.0",
       "resolved": "https://registry.npmjs.org/commander/-/commander-2.9.0.tgz",
       "integrity": "sha1-nJkJQXbhIkDLItbFFGCYQA/g99Q=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "graceful-readlink": "1.0.1"
+      }
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     "concat-map": {
       "version": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
@@ -202,7 +263,12 @@
     "concat-stream": {
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       "integrity": "sha1-CqxmL9Ur54lk1VMvaUeE5wEQrPc=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "inherits": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz",
+        "readable-stream": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.2.9.tgz",
+        "typedarray": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz"
+      }
     },
     "core-util-is": {
       "version": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
@@ -212,12 +278,18 @@
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       "integrity": "sha1-dUu1v+VUUdpppYuU1F9MWwRi1Y8=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "es5-ext": "https://registry.npmjs.org/es5-ext/-/es5-ext-0.10.15.tgz"
+      }
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     "debug": {
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       "integrity": "sha1-qfpvvpykPPHnn3O3XAGJy7fW21o=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "ms": "https://registry.npmjs.org/ms/-/ms-0.7.3.tgz"
+      }
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     "decamelize": {
       "version": "https://registry.npmjs.org/decamelize/-/decamelize-1.2.0.tgz",
@@ -233,42 +305,89 @@
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       "integrity": "sha1-wSyYHQZ4RshLyvhiz/kw2Qf/0ag=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "globby": "https://registry.npmjs.org/globby/-/globby-5.0.0.tgz",
+        "is-path-cwd": "https://registry.npmjs.org/is-path-cwd/-/is-path-cwd-1.0.0.tgz",
+        "is-path-in-cwd": "https://registry.npmjs.org/is-path-in-cwd/-/is-path-in-cwd-1.0.0.tgz",
+        "object-assign": "https://registry.npmjs.org/object-assign/-/object-assign-4.1.1.tgz",
+        "pify": "https://registry.npmjs.org/pify/-/pify-2.3.0.tgz",
+        "pinkie-promise": "https://registry.npmjs.org/pinkie-promise/-/pinkie-promise-2.0.1.tgz",
+        "rimraf": "https://registry.npmjs.org/rimraf/-/rimraf-2.6.1.tgz"
+      }
     },
     "doctrine": {
       "version": "https://registry.npmjs.org/doctrine/-/doctrine-2.0.0.tgz",
       "integrity": "sha1-xz2NKQnSIpHhoAejlYBNqLZl/mM=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "esutils": "https://registry.npmjs.org/esutils/-/esutils-2.0.2.tgz",
+        "isarray": "https://registry.npmjs.org/isarray/-/isarray-1.0.0.tgz"
+      }
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       "integrity": "sha1-wzClk0we4hKEp8CBqG5f2TfJHqY=",
-      "dev": true
+      "dev": true,
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-      "dev": true
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+      "requires": {
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+        "es5-ext": "https://registry.npmjs.org/es5-ext/-/es5-ext-0.10.15.tgz"
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       "integrity": "sha1-XjqzIlH/0VOKH45f+hNXdy+S2W8=",
-      "dev": true
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+      "requires": {
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+        "es5-ext": "https://registry.npmjs.org/es5-ext/-/es5-ext-0.10.15.tgz",
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@@ -279,6 +398,13 @@
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       "integrity": "sha1-WltTr0aTEQvrsIZ6o0MN07cKEBg=",
       "dev": true,
+      "requires": {
+        "esprima": "https://registry.npmjs.org/esprima/-/esprima-2.7.3.tgz",
+        "estraverse": "https://registry.npmjs.org/estraverse/-/estraverse-1.9.3.tgz",
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       "dependencies": {
         "wordwrap": {
           "version": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.3.tgz",
@@ -698,7 +1042,15 @@
     "optionator": {
       "version": "https://registry.npmjs.org/optionator/-/optionator-0.8.2.tgz",
       "integrity": "sha1-NkxeQJ0/TWMB1sC0wFu6UBgK62Q=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "deep-is": "https://registry.npmjs.org/deep-is/-/deep-is-0.1.3.tgz",
+        "fast-levenshtein": "https://registry.npmjs.org/fast-levenshtein/-/fast-levenshtein-2.0.6.tgz",
+        "levn": "https://registry.npmjs.org/levn/-/levn-0.3.0.tgz",
+        "prelude-ls": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.1.2.tgz",
+        "type-check": "https://registry.npmjs.org/type-check/-/type-check-0.3.2.tgz",
+        "wordwrap": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz"
+      }
     },
     "os-homedir": {
       "version": "https://registry.npmjs.org/os-homedir/-/os-homedir-1.0.2.tgz",
@@ -733,7 +1085,10 @@
     "pinkie-promise": {
       "version": "https://registry.npmjs.org/pinkie-promise/-/pinkie-promise-2.0.1.tgz",
       "integrity": "sha1-ITXW36ejWMBprJsXh3YogihFD/o=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "pinkie": "https://registry.npmjs.org/pinkie/-/pinkie-2.0.4.tgz"
+      }
     },
     "platform": {
       "version": "https://registry.npmjs.org/platform/-/platform-1.3.4.tgz",
@@ -770,7 +1125,15 @@
       "version": "1.13.2",
       "resolved": "https://registry.npmjs.org/q-io/-/q-io-1.13.2.tgz",
       "integrity": "sha1-7qEw1IHdteGqG8WmaFX3OR0G8AM=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "collections": "0.2.2",
+        "mime": "1.3.6",
+        "mimeparse": "0.1.4",
+        "q": "1.4.1",
+        "qs": "1.2.2",
+        "url2": "0.0.0"
+      }
     },
     "qs": {
       "version": "1.2.2",
@@ -781,17 +1144,34 @@
     "readable-stream": {
       "version": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.2.9.tgz",
       "integrity": "sha1-z3jsb0ptHrQ9JkiMrJfwQudLf8g=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "buffer-shims": "https://registry.npmjs.org/buffer-shims/-/buffer-shims-1.0.0.tgz",
+        "core-util-is": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
+        "inherits": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz",
+        "isarray": "https://registry.npmjs.org/isarray/-/isarray-1.0.0.tgz",
+        "process-nextick-args": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-1.0.7.tgz",
+        "string_decoder": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.0.0.tgz",
+        "util-deprecate": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz"
+      }
     },
     "readline2": {
       "version": "https://registry.npmjs.org/readline2/-/readline2-1.0.1.tgz",
       "integrity": "sha1-QQWWCP/BVHV7cV2ZidGZ/783LjU=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "code-point-at": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
+        "is-fullwidth-code-point": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
+        "mute-stream": "https://registry.npmjs.org/mute-stream/-/mute-stream-0.0.5.tgz"
+      }
     },
     "rechoir": {
       "version": "https://registry.npmjs.org/rechoir/-/rechoir-0.6.2.tgz",
       "integrity": "sha1-hSBLVNuoLVdC4oyWdW70OvUOM4Q=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "resolve": "https://registry.npmjs.org/resolve/-/resolve-1.3.3.tgz"
+      }
     },
     "repeat-string": {
       "version": "https://registry.npmjs.org/repeat-string/-/repeat-string-1.6.1.tgz",
@@ -801,12 +1181,19 @@
     "require-uncached": {
       "version": "https://registry.npmjs.org/require-uncached/-/require-uncached-1.0.3.tgz",
       "integrity": "sha1-Tg1W1slmL9MeQwEcS5WqSZVUIdM=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "caller-path": "https://registry.npmjs.org/caller-path/-/caller-path-0.1.0.tgz",
+        "resolve-from": "https://registry.npmjs.org/resolve-from/-/resolve-from-1.0.1.tgz"
+      }
     },
     "resolve": {
       "version": "https://registry.npmjs.org/resolve/-/resolve-1.3.3.tgz",
       "integrity": "sha1-ZVkHw0aahoDcLeOidaj91paR8OU=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "path-parse": "https://registry.npmjs.org/path-parse/-/path-parse-1.0.5.tgz"
+      }
     },
     "resolve-from": {
       "version": "https://registry.npmjs.org/resolve-from/-/resolve-from-1.0.1.tgz",
@@ -816,23 +1203,36 @@
     "restore-cursor": {
       "version": "https://registry.npmjs.org/restore-cursor/-/restore-cursor-1.0.1.tgz",
       "integrity": "sha1-NGYfRohjJ/7SmRR5FSJS35LapUE=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "exit-hook": "https://registry.npmjs.org/exit-hook/-/exit-hook-1.1.1.tgz",
+        "onetime": "https://registry.npmjs.org/onetime/-/onetime-1.1.0.tgz"
+      }
     },
     "right-align": {
       "version": "https://registry.npmjs.org/right-align/-/right-align-0.1.3.tgz",
       "integrity": "sha1-YTObci/mo1FWiSENJOFMlhSGE+8=",
       "dev": true,
-      "optional": true
+      "optional": true,
+      "requires": {
+        "align-text": "https://registry.npmjs.org/align-text/-/align-text-0.1.4.tgz"
+      }
     },
     "rimraf": {
       "version": "https://registry.npmjs.org/rimraf/-/rimraf-2.6.1.tgz",
       "integrity": "sha1-wjOOxkPfeht/5cVPqG9XQopV8z0=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "glob": "https://registry.npmjs.org/glob/-/glob-7.1.1.tgz"
+      }
     },
     "run-async": {
       "version": "https://registry.npmjs.org/run-async/-/run-async-0.1.0.tgz",
       "integrity": "sha1-yK1KXhEGYeQCp9IbUw4AnyX444k=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "once": "https://registry.npmjs.org/once/-/once-1.4.0.tgz"
+      }
     },
     "rx-lite": {
       "version": "https://registry.npmjs.org/rx-lite/-/rx-lite-3.1.2.tgz",
@@ -842,7 +1242,12 @@
     "shelljs": {
       "version": "https://registry.npmjs.org/shelljs/-/shelljs-0.7.7.tgz",
       "integrity": "sha1-svXHfvlxSPS09uImguELuoZnz/E=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "glob": "https://registry.npmjs.org/glob/-/glob-7.1.1.tgz",
+        "interpret": "https://registry.npmjs.org/interpret/-/interpret-1.0.3.tgz",
+        "rechoir": "https://registry.npmjs.org/rechoir/-/rechoir-0.6.2.tgz"
+      }
     },
     "slice-ansi": {
       "version": "https://registry.npmjs.org/slice-ansi/-/slice-ansi-0.0.4.tgz",
@@ -853,27 +1258,41 @@
       "version": "https://registry.npmjs.org/source-map/-/source-map-0.2.0.tgz",
       "integrity": "sha1-2rc/vPwrqBm03gO9b26qSBZLP50=",
       "dev": true,
-      "optional": true
+      "optional": true,
+      "requires": {
+        "amdefine": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz"
+      }
     },
     "sprintf-js": {
       "version": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
       "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw=",
       "dev": true
     },
-    "string_decoder": {
-      "version": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.0.0.tgz",
-      "integrity": "sha1-8G9BFXtmTYYGn4S9vcmw2KsoFmc=",
-      "dev": true
-    },
     "string-width": {
       "version": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
       "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "code-point-at": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
+        "is-fullwidth-code-point": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
+        "strip-ansi": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz"
+      }
+    },
+    "string_decoder": {
+      "version": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.0.0.tgz",
+      "integrity": "sha1-8G9BFXtmTYYGn4S9vcmw2KsoFmc=",
+      "dev": true,
+      "requires": {
+        "buffer-shims": "https://registry.npmjs.org/buffer-shims/-/buffer-shims-1.0.0.tgz"
+      }
     },
     "strip-ansi": {
       "version": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
       "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "ansi-regex": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz"
+      }
     },
     "strip-bom": {
       "version": "https://registry.npmjs.org/strip-bom/-/strip-bom-3.0.0.tgz",
@@ -894,6 +1313,14 @@
       "version": "https://registry.npmjs.org/table/-/table-3.8.3.tgz",
       "integrity": "sha1-K7xULw/amGGnVdOUf+/Ys/UThV8=",
       "dev": true,
+      "requires": {
+        "ajv": "https://registry.npmjs.org/ajv/-/ajv-4.11.8.tgz",
+        "ajv-keywords": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-1.5.1.tgz",
+        "chalk": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+        "lodash": "https://registry.npmjs.org/lodash/-/lodash-4.17.4.tgz",
+        "slice-ansi": "https://registry.npmjs.org/slice-ansi/-/slice-ansi-0.0.4.tgz",
+        "string-width": "https://registry.npmjs.org/string-width/-/string-width-2.0.0.tgz"
+      },
       "dependencies": {
         "is-fullwidth-code-point": {
           "version": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
@@ -903,7 +1330,11 @@
         "string-width": {
           "version": "https://registry.npmjs.org/string-width/-/string-width-2.0.0.tgz",
           "integrity": "sha1-Y1xUNsxypuDDh87KJ41OLuxSaH4=",
-          "dev": true
+          "dev": true,
+          "requires": {
+            "is-fullwidth-code-point": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
+            "strip-ansi": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz"
+          }
         }
       }
     },
@@ -925,7 +1356,10 @@
     "type-check": {
       "version": "https://registry.npmjs.org/type-check/-/type-check-0.3.2.tgz",
       "integrity": "sha1-WITKtRLPHTVeP7eE8wgEsrUg23I=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "prelude-ls": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.1.2.tgz"
+      }
     },
     "typedarray": {
       "version": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
@@ -937,6 +1371,11 @@
       "integrity": "sha1-1Uk0d4qNoUkD+imjJvskwKtRoaA=",
       "dev": true,
       "optional": true,
+      "requires": {
+        "source-map": "https://registry.npmjs.org/source-map/-/source-map-0.5.6.tgz",
+        "uglify-to-browserify": "https://registry.npmjs.org/uglify-to-browserify/-/uglify-to-browserify-1.0.2.tgz",
+        "yargs": "https://registry.npmjs.org/yargs/-/yargs-3.10.0.tgz"
+      },
       "dependencies": {
         "source-map": {
           "version": "https://registry.npmjs.org/source-map/-/source-map-0.5.6.tgz",
@@ -961,7 +1400,10 @@
     "user-home": {
       "version": "https://registry.npmjs.org/user-home/-/user-home-2.0.0.tgz",
       "integrity": "sha1-nHC/2Babwdy/SGBODwS4tJzenp8=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "os-homedir": "https://registry.npmjs.org/os-homedir/-/os-homedir-1.0.2.tgz"
+      }
     },
     "util-deprecate": {
       "version": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
@@ -977,7 +1419,10 @@
     "which": {
       "version": "https://registry.npmjs.org/which/-/which-1.2.14.tgz",
       "integrity": "sha1-mofEN48D6CfOyvGs31bHNsAcFOU=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "isexe": "https://registry.npmjs.org/isexe/-/isexe-2.0.0.tgz"
+      }
     },
     "window-size": {
       "version": "https://registry.npmjs.org/window-size/-/window-size-0.1.0.tgz",
@@ -998,7 +1443,10 @@
     "write": {
       "version": "https://registry.npmjs.org/write/-/write-0.2.1.tgz",
       "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "mkdirp": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz"
+      }
     },
     "xtend": {
       "version": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
@@ -1009,7 +1457,13 @@
       "version": "https://registry.npmjs.org/yargs/-/yargs-3.10.0.tgz",
       "integrity": "sha1-9+572FfdfB0tOMDnTvvWgdFDH9E=",
       "dev": true,
-      "optional": true
+      "optional": true,
+      "requires": {
+        "camelcase": "https://registry.npmjs.org/camelcase/-/camelcase-1.2.1.tgz",
+        "cliui": "https://registry.npmjs.org/cliui/-/cliui-2.1.0.tgz",
+        "decamelize": "https://registry.npmjs.org/decamelize/-/decamelize-1.2.0.tgz",
+        "window-size": "https://registry.npmjs.org/window-size/-/window-size-0.1.0.tgz"
+      }
     }
   }
 }
diff --git a/request/request.js b/request/request.js
index 76e218c9..84f5e4ce 100644
--- a/request/request.js
+++ b/request/request.js
@@ -67,10 +67,10 @@ module.exports = function($window, Promise) {
 
 			xhr.open(args.method, args.url, typeof args.async === "boolean" ? args.async : true, typeof args.user === "string" ? args.user : undefined, typeof args.password === "string" ? args.password : undefined)
 
-			if (args.serialize === JSON.stringify && useBody) {
+			if (args.serialize === JSON.stringify && useBody && !(args.headers && args.headers.hasOwnProperty("Content-Type"))) {
 				xhr.setRequestHeader("Content-Type", "application/json; charset=utf-8")
 			}
-			if (args.deserialize === deserialize) {
+			if (args.deserialize === deserialize && !(args.headers && args.headers.hasOwnProperty("Accept"))) {
 				xhr.setRequestHeader("Accept", "application/json, text/*")
 			}
 			if (args.withCredentials) xhr.withCredentials = args.withCredentials
diff --git a/test-utils/tests/test-xhrMock.js b/test-utils/tests/test-xhrMock.js
index 8bdfcf21..8c64a308 100644
--- a/test-utils/tests/test-xhrMock.js
+++ b/test-utils/tests/test-xhrMock.js
@@ -72,6 +72,14 @@ o.spec("xhrMock", function() {
 			}
 			xhr.send("a=b")
 		})
+		o("Setting a header twice merges the header", function() {
+			// Source: https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/setRequestHeader
+			var xhr = new $window.XMLHttpRequest()
+			xhr.open("POST", "/test")
+			xhr.setRequestHeader("Content-Type", "foo")
+			xhr.setRequestHeader("Content-Type", "bar")
+			o(xhr.getRequestHeader("Content-Type")).equals("foo, bar")
+		})
 	})
 	o.spec("jsonp", function() {
 		o("works", function(done) {
diff --git a/test-utils/xhrMock.js b/test-utils/xhrMock.js
index d3bbf5b8..379bce28 100644
--- a/test-utils/xhrMock.js
+++ b/test-utils/xhrMock.js
@@ -17,7 +17,17 @@ module.exports = function() {
 			var headers = {}
 			var aborted = false
 			this.setRequestHeader = function(header, value) {
-				headers[header] = value
+				/*
+				 the behavior of setHeader is not your expected setX API.
+				 If the header is already set, it'll merge with whatever you add
+				 rather than overwrite
+				 Source: https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/setRequestHeader
+				 */
+				if (headers[header]) {
+					headers[header] += ", " + value;
+				} else {
+					headers[header] = value
+				}
 			}
 			this.getRequestHeader = function(header) {
 				return headers[header]