diff --git a/lib/src/sparql/model.rs b/lib/src/sparql/model.rs
index 7bce5d5f..b2d0709c 100644
--- a/lib/src/sparql/model.rs
+++ b/lib/src/sparql/model.rs
@@ -106,10 +106,10 @@ impl FileSyntax for QueryResultSyntax {
     fn from_mime_type(media_type: &str) -> Option<Self> {
         if let Some(base_type) = media_type.split(';').next() {
             match base_type {
-                "application/xml" | "application/sparql-results+xml" => {
+                "application/sparql-results+xml" | "application/xml" | "text/xml" => {
                     Some(QueryResultSyntax::Xml)
                 }
-                "application/json" | "application/sparql-results+json" => {
+                "application/sparql-results+json" | "application/json" | "text/json" => {
                     Some(QueryResultSyntax::Json)
                 }
                 _ => None,
diff --git a/lib/src/syntax.rs b/lib/src/syntax.rs
index 1e68ab73..5d1aa5e7 100644
--- a/lib/src/syntax.rs
+++ b/lib/src/syntax.rs
@@ -60,9 +60,11 @@ impl FileSyntax for GraphSyntax {
     fn from_mime_type(media_type: &str) -> Option<Self> {
         if let Some(base_type) = media_type.split(';').next() {
             match base_type {
-                "application/n-triples" => Some(GraphSyntax::NTriples),
-                "text/turtle" => Some(GraphSyntax::Turtle),
-                "application/xml" | "application/rdf+xml" => Some(GraphSyntax::RdfXml),
+                "application/n-triples" | "text/plain" => Some(GraphSyntax::NTriples),
+                "text/turtle" | "application/turtle" | "application/x-turtle" => {
+                    Some(GraphSyntax::Turtle)
+                }
+                "application/rdf+xml" | "application/xml" | "text/xml" => Some(GraphSyntax::RdfXml),
                 _ => None,
             }
         } else {
@@ -105,8 +107,10 @@ impl FileSyntax for DatasetSyntax {
     fn from_mime_type(media_type: &str) -> Option<Self> {
         if let Some(base_type) = media_type.split(';').next() {
             match base_type {
-                "application/n-quads" => Some(DatasetSyntax::NQuads),
-                "application/trig" => Some(DatasetSyntax::TriG),
+                "application/n-quads" | "text/x-nquads" | "text/nquads" => {
+                    Some(DatasetSyntax::NQuads)
+                }
+                "application/trig" | "application/x-trig" => Some(DatasetSyntax::TriG),
                 _ => None,
             }
         } else {
diff --git a/server/src/main.rs b/server/src/main.rs
index 34dc4cfb..76b60485 100644
--- a/server/src/main.rs
+++ b/server/src/main.rs
@@ -343,7 +343,7 @@ mod tests {
     #[test]
     fn post_unsupported_file() {
         let mut request = Request::new(Method::Post, Url::parse("http://localhost/").unwrap());
-        request.insert_header("Content-Type", "text/plain");
+        request.insert_header("Content-Type", "text/foo");
         exec(request, StatusCode::UnsupportedMediaType)
     }